If you have a high end nvidia card, you can buy a 3D tv and use nvidias 3Dtv play software, then you can hook your xbox/ps3 to the tv (as long as it has 2 HDMI and 1 DVI or 3 HDMI slots) then you will be fine.
For example, Mitsubishi WD-65735 65-Inch 1080p DLP HDTV, i was reading a forum, guy had that tv hooked up to a ps3 and his pc. Not really sure a xbox360 has 3d support.