I have a small George Foreman. It fits about 2 small chicken breasts, barely. It has the bun warmer compartment on top - although I've never used it, so I'm not sure how good it works. I love how easy it is and how quickly it cooks food.
I do have a few complaints about mine, though.. first, I wish it was bigger - at least 100 sq. inches (mine is 36, I think). This was a gift, so I can't complain too much, but I wish it was at least twice the size. Second, I wish it had the removable plates. If I were shopping for a new one, this would be a MUST. It is such a pain in the rear to try and clean this grill off without being able to remove the plates.
If I were going to get a new one, it'd be a toss up between these two:
http://www.georgeforemancooking.com/p-53-power-grill-grill-griddle.aspx
http://www.georgeforemancooking.com/p-15-precision-grill.aspx