In my opinion, HDTV only matters as you move towards larger screens. Also, you don't really need HDTV for the Wii. The Wii only supports 480p while HDTV resolution starts from 720p. So using the Wii with an HDTV is kinda like having a 1200 x 1024 PC monitor but only using 1024 x 768 resolution. If you have a display system that supports 480p then you should be fine. If it doesn't and you've buying a new TV anyway, then you might as well buy an HDTV.