Thank you for all of your input.
Some of you have said that the price of HDTVs will drop considerably after Christmas. What basis do you have to believe this? If this is the case, I might just pick up one of those Dvigi things for $50, and wait 6-12 months to get an HDTV that would be good for gaming and under $400. Does DVigi work well with systems other than XBox such as PS2? The Advent one is a tempting purchase though, but if I could get an even better one and just spend $50 today, that would be the more prudent option.
I have been waiting about 4 years to upgrade to HDTV, with the hope that the price would fall into my range. I got an XBox a few days ago, but my 1990 24" Toshiba isn't cutting it. Ninja Gaiden looks nothing like the screen shots on my TV, its just way too fuzzy and not vibrant at all. So after a day of playing it, I decided I just couldn't play my XBox on such a TV.