My advice to you is to keep reading, Toby. Get the ARBA Standard of Perfection-but wait a week or two, I believe the new one is coming out after Convention. READ IT. A LOT. How many points is the head on a ND worth? The hindquarters? Ears? Fur? What are the disqualifications?
Have you read up about peanuts? Max factor kits? Are you sure you can handle those situations?
Read about color genetics. Again. A LOT. What color do you want to specialize in? More than one? Are the colors genetically compatible? Many are not.
GO TO A SHOW. Watch the breed you want being judged. Listen to the judge's comments, look at the animals and how the judge is placing them.
When you buy a rabbit, arrange to meet the breeder at the show. Have the breeder show you a rabbit, have them tell you about the good and bad points. Before the show officially starts or during the lunch break, approach one of the judges and tell them you're new, and you'd like their opinion on a rabbit you're thinking of buying. Usually they're happy to look at a rabbit for you. They might be more realistic about the quality of the animals and it's prospects as a show/breeding animal.
Now, if you want a critique... I'd say none of them for the simple fact they all look like young juniors. I know baby rabbits are ADORABLE, but they can grow up to be less that stellar animals. I'd rather see you looking at some rabbits in the 5-7 month range, older juniors or young seniors. I am also leery about buying rabbits from someone I don't know without putting my hands on them first. There is a lot about a rabbit you can only tell from feel, or seeing it up close. From these pictures alone, this is my opinion:
#1: In order to properly judge type, I need a profile view. From here I can only kind of judge the head and ears. Ears look okay, head not so much; it appears to be long and narrow. Even in a young buck you want a round massive head.
#2: This buck looks to have a nicer head, but the ears seem pointed and long compared to the rest of him. His body looks...okay. Not terrible, not great.
#3: Absolutely not. She has a narrow head, pointed nose, and those ears are going to get he disqualified. I can almost promise you she's going to be at least three pounds full grown, too big to show.
#4: This buck looks like the best of the ones you posted. Again, I really can't tell much about his type but he seems to have a decent head and thick, short, round ears. He appears to have a lot of scattered white hairs in his colored areas, but I'm not sure how heavily they are faulting that in the brokens.
These are a few pics of some nice looking NDs I found, this is more what you want to shoot for. Note none of them are perfect, but they are closer to the ideal: