i would NEVER suggest an aquarium, the amonia and dust form the poop build up, birds need ventilation.
aquariums are also MUCH too small!
get a wire cage, the largest you can afford no matter what type of bird.
finches are nice, there a hands off kind of bird, ive personally met a few that will sit on a finger, but those are rare, they are flightly, fast and tiny!
finches do best in groups, a pair is a minmum, dont give them a nest unles syou want eggs, females will lay without a male, they will just be unviable (like hens) finches (along with canary) can be incredibly prolific with laying, often 2-3 clutches a year at 4-6 eggs average.
finches are nice QUIET birds, they dont squark or sqeek but instead make a soft metalic type peeping sound. they also come in some GORGEOUS colors. (look up gouldians) zebras are relitivly cheap and a nice starting finch and pretty to look at.
these are active little birds and prefer a flight cage...LONGER rather than taller
http://www.google.com/products/catalog?hl=en&q=flight+cage&cid=14824520297801650245&sa=title#p
would be a great cage for a pair of finch, but id remove the wooden dowels they have in there and replace them with shorter ones on either end going depth ways instead of long ways (so they can "fly" the lenght of the cage form one to the other.
http://www.finchaviary.com/
that cage would also work nicely for a pair of canary, a little more expensive but the joys of a male timbraro canaries voice...just wow.
Doves are beutiful BUT unfortunatly have been mis represented by reacent pet trade, these birds need SPACE, at a minimum of 10sqft per small pair (ie diamond doves) and 20 for the larger species (ie white doves)
http://www.google.com/products/catalog?hl=en&q=flight+cage&cid=14824520297801650245&sa=title#p
they are however lovely soft sounding birds, with generally sweet curious natures, with frequent handling and time spent with them they can become incredibly human friendly! if you have the kind of space needed the diamond dove is a cute little bird. again they need a wire cage and perfer something longer rather than tall.
while the bird itself will be relitivly cheap, the cost for building a cage big enough might be off putting...
keeping a dove in a bird cage is like keeping an adult in a 6x6 room their entire lives...can they survive...yes, will they truly thrive, no...
the parakeet, actually named the budgerigar comes in 2 verities...
the english
http://englishbudgie.com/
is the larger of the 2, often has a much larger domed head and of the 2 verieties the most likley to talk. they have higher pitched robotoc sounding voices when they do talk and often pick up whistles and small 1-2 sylable words. the english budgie is the breed that has the record for most words known (while the grey is known most for its talking ability that tiny budgie knew more words total!)
the american budgie (parakeet most often sold in petstores) is smaller than the english with a les pronounced head. there more likley to whistle than talk.
both verities care is about the same.
these little guys are PARROTS, they are active, curious and inteligent. they also love attention.
first a warning: DO NOT GET A HANDFED PARAKEET! handfed budgies are known as "pirannah birds" its not that they are "mean" its that they dont realiy differenciate between fingers and food, and instead fingers = food and you will get nibbled...ALOT.
the good news is, youn g budgies tame down VERY quickly and nicely when parent raised as long as your willing to spend the time.
a "tame" budgie will love nothing more than sitting on your shoulder, playing with your hair and whispering "sweet nothings" to you.
they require a relitivly large cage for their size, i personally wont go less than a 16 x 20 for a single to pair of keets as they are reiltivly active birds.
if you just want something pretty to look at this is also a good choice as a pair will be quite happy with eachothers company...
please be aware through that while they are not realy LOUD birds, their chattering can get some good volume.
Lovebirds:
not a bird id suggest for a beginner
they are a tiny little parrot that bonds VERY strongly with its partner...
if you get 2, they will bond to eachother, get one hell bond to YOU...
for the right home however they are loving, active playfull birds, but again these are parrots, they require a large cage again, much larger than most stores sell for a "lovebird" (instead look for a conure cage)
if getting a love bird find one hand raised, unlike parakeets they dont have a tendency to be nippy when hand raised and make much better pets.
parent raised if you plan on keeping a pair that wont be let out of the cage much however is a cheaper option.
and lovebirds can be LOUD...there not screamers like the larger parrot breeds, but they have a very LOUD high pitches chirp they yell out when trying to "contact the flock"
theres a gentleman in our town with a lovebird who goes everywhere with him (he rides around in his hoodie) the pair are inseperable...but no joke, you can hear them gomming 1/2 a mile away because every 2-5 minutes the little lovebird lets out his peep to let other lovebirds know hes around...he just doesnt get that there are no other lovebirds to answer him...
now of the birds you asked about id say either a pair of finches if your wanting a no handle kind of bird...
or a nice parakeet or 2 if your wanting something you can get out and play with but not ready for a larger "parrot type"
but im also going to suggest you do some reserch into the Parrotlet.
a tiny little parrot with a tiny little voice and a whole lot of attitude! they are more advanced than the others youve mentioned but in my experience easier to keep and handle (and much quieter) than the lovebird.
im also going to suggest you loook into liniolated parakeets, another sweet, quieter, playfull bird that comes in some stunning colors.
as a general rule for cage sizing...
if it says its big enough for a canary or finch, its not big enough to keep ANYTHING in...
if it says its big enough for a parakeet, its the SMALLEST size you should do for a finch...
if its big enough for a cockateil/small conure, its an OK cage for a single parakeet that gets lots of out of cage time.
large conure...yup thatll suit a green cheek, teil, lovvie or p-let
small parrot, thatll do you for the small-medium conures ect...
the cages sold in shops as advertised are NEVER the right size for the bird their advertised for.
id NEVER keep a parakeet in those tiny little cages, nor would i keep a lovebird in anything less than conure sized.
bar spacing however is imprtant!