Get HDTV service from your cable/satellite company and get a good upconverting DVD player. If you have a dream system with DVD player, forget about the quality of it. Sony, while making some very good products, does not have a very good reputation with upconversion, especially in DVD players recently.
So, besides the eventually Blu-ray player - or maybe a PS3, HD cable and good upconverting DVD players are it.
Computers are computers and there are ten billion tweaks you can/should do to get them to look perfect on your display, but I'm not the one to tell you how to do that.