The real problem is most people are told (by salespeople etc.) that the TVs do support 720p. Even though many don't.
LCoS is pretty new and hard to find (and expensive). For example, the only LCoS TV I know of that includes DVI and FireWire is $21,000.
Also, some DLP sets that support 720p native, do 1080i really bad. You really need to take your XBOX to the store with the HD connection kit and try it out on the set before buying.
