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It's his money, he can spend it any way he wants.
The best place to learn anything about home A/v is the avsforum. Just do some searches in the appropriate forums in you'll find a wealth of information.
Briefly, the major innovation in A/V is digital. DVI & HDMI preserve the content in its digital form from the source (dvd player, cable box, sat, etc) to the display device. This avoids the A2D conversions that rob you of picture and sound quality. The biggest benefits are when the display device is a fixed pixel display, like an LCD, LCD-RP, DLP-RP, or one of the newer LCOS sets. Most Tube Tv's, CRT-RP, and plasmas are not digital.
DVI is video, HDMI is audio and video on the same cable. I believe there is another format called iLink which is essentialy a pure digital audio interconnect.
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From the day of his birth Gilgamesh was called by name.
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