We had a Kenwood one on the rib, front folds down and the ipod sits inside the unit and connects by cable. worked well but although it was rated as waterproof, i noticed some rust on some of the fixing screws not long after it was installed. (there should be some pictures somewhere on here)
Think Fusion do a good one as well.
if i was doing it again i would have a unit inside the console and a jack cable (or other method of connecting) into one of the lockers or glove box and a small remote control unit on the console.
less space taken up on the console and less to get wet and damaged!
on the supplier i sourced mine from various places on the web and had it installed but believe Marine AV have always been ok to deal with in the past www.marine-audio.com