You'll find a million threads on this subject if you do a search and they will all tell you that DVI is hands-down a better picture. Since your machine will only has one DVI input and you see the quality difference you will want to buy a DVI switcher from Gefen and as many DVI output devices (Bravo D2, Momistu DVD players) DISH (811 and 921 receivers) as possible.
Dom
Dom