As mentioned above, Sprite and Midget are the same car, with a few trim differences. I've a preference for the '65 and earlier cars. Bugeye's tend to be quite a bit more expensive -- but the driving experience should be very similar. The side-screen cars (Bugeye, Sprite Mk2 and Midget Mk1) have a bit more elbow room.
One of the best smiles-per-dollar available!