If at all possible, I believe you are better off getting a rabbit from a breeder. The rabbit doesn't get subjected to the stress of going through the pet shop, and you can see the rabbit's parents (which gives you an idea of where your bunny is headed, both as far as size and temperament). The breeder should be able to answer any questions you may have about your prospective pet. Sadly, at most of the pet shops I have visited, it seemed that all the personnel knew about rabbits was how to ring them up on the cash register!
I have five breeds that I work with: Netherland Dwarf, Holland Lop, Mini Rex, Jersey Wooly, and Harlequin. I have known love bugs and "dragon rabbits" in all of them. My experience leads me to believe that a certain amount of personality is inheritable, so if a rabbit turns out snotty, I won't breed from it. That goes for any breed!
Some of the sweetest buns I have ever known were ND's, but some of the nastiest, as well. Most of my daughter's favorites have been Dwarfs, but she's been kind of partial to the Woolies, too. A Wooly with a good coat seldom needs to be brushed, but the ones with bad coats are a disaster!
Most of my lops have had rather forceful personalities. Whether sweet or cranky, one thing they won't be is ignored!
I have had more people come looking for a Dwarf, get their hands on a Mini Rex, and that was it. One touch, and they were sold! The only problem I have with the MR is its claws. I don't know how it is possible, but the MR has sharper claws than any other breed I have ever handled. If you get a Mini Rex, you will want to use your claw clipper often!
Harlequins are a probably a little bigger than what you are looking for (6 to 9 lbs.) but they are always colorful and interesting. Even the ones that aren't particularly friendly are usually at least docile - I don't think I have ever had a Harlie "freak out" and try to lacerate me (anyone who handles rabbits a lot knows what I'm talking about!) My very best rabbit ambassadors have all been Harlies.