Go to http://www.avsforum.com and you will learn more than you ever wanted to know ;~). Be prepared for a whole new jargon from some hardcore techn-geeks!
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My suggestion is to wait untill this all gets ironed out. 2006 is the year planned for HDTV to become the de jure standard. Ha! It will probably be delayed again. I suspect by 2006 at least standards might be resolved, if not in place. By that time some of the newer technologies might have matured to the point that they are reliable and compatable. Heck, we might even have HI DEF DVD, HI DEF DVR's or who knows what other form of media. Early adopters pay a premimum to be beta guinea pigs.
My understanding is that HDMI is DVI+audio. There are some finer nuances relative to transmission distance that the avsforum folks can tell you about, but there are HDMI to DVI dongles that you can buy that make HDMI DVI input capable. I'm not sure I'd count on resolution by 2006--that is just the date that the b/casters are supposed to turn in their analog allotments, but there are a lot of caveats on that--principally that 85% of homes in a market have to be capable of receiving an HDTV transmission. That is probably right up there with penetration rates for flush toilets.