I have watched ebay on and off but never saw an ikelite housing for an XTI ever on ebay (except for new ones going for > $1000). I agree though...their port selection is much better and their domes are cheaper too.
I did buy the fantasea on ebay and just couldn't pass up the deal I got on it. For $650 I have the housing, basic port, and flash housing for my 580ex. A bunch of little stuff like the cords, led flocus light, arm, extra o rings, etc also included. This may just prove to be a good way to start and then maybe I'll sell this for not much less than I bought it for if I really like underwater photography. By then I might decide I'd rather invest in video equipment or a better camera anyway. It sure would have been sweet to find a used dome port for this too and come in under a grand for the whole thing!