I've owned rabbits for years and I can say, it really depends on the rabbit. I've had some rabbits who need 2 or 3 friends to keep sane, but some others will sit outside the group and be content with that.

If you're getting a young rabbit, just get one for the start. They can be quite a handful, which is why I prefer my oldies! Such a great pet, though, I absolutely love mine. Full of personality, just make sure you rabbit-proof your house first. They will chew paper, wires, wood, floors, walls... *sigh*. Otherwise, if you do get one, make sure to post pictures!