-ATI Radeon 4850 on the 21.5"
-I really don't care about quad-cores being standard, but it would be a nice customization option.
-HDMI-in 😀 Or a Mini-DVI to HDMI adaptor made by Apple. I don't want to buy a $300 TV if I have a 1080p LED monitor.
Only fails for the current iMacs would be the crappy GPU and no HDMI-in. Also, about the touch screen, if Apple thinks about doing it they should definitely make a seperate computer and OS.
After reading other responses. I love the gaming iMac idea. Apple should release a whole gaming line, 330M 13" MacBook Pro, 330M Mac Mini, 4850 21.5" iMac, 5XXX 27" iMac (Personally hate the giant screens), gaming Mac Pro with a slightly less amazing processor and hard drive but great video cards. Maybe MacBook Air 320M or 330M.
How bout an alternate color option. All black iMac?