Honestly, I'd rather a gaming PC. Most of the games - WRPGs and FPS I'd be interested in HD I'd much rather play with a mouse/keyboard.
Had/have a 360 (son took it to college) if I was to get another HD console, I'd probably get a PS3 for Heavy Rain & Drake's Fortune (and now that Bioware is no longer 360 exclusive). Also Move interests me more than Kinect and would be better for FPS (can't stand dual analog)