Personally, unless they were going to be a house rabbit, I would look for a bonded pair from a rescue. That way the difficult things like neutering and bonding have already been done for you and you are all set to start enjoying your rabbits!
A really good book if you haven't seen it already is 'The Problem With Rabbits' by Pat Rees. You can get it from Amazon and the Rabbit Welfare Association website.
Other then that, you should probably be looking at small/medium sized rabbits and, if possible, ones that don't mind being handled too much.