I am planning on moving to an apartment using my PC as my entertainment center. Using my TV I would like to hook up my Wii and an HDTV tuner. I am assuming that I would need a specific video card to do this. What video card (or features in one) would I need? How can I get the HDTV signal (what type of tuner should I get?) to play on my monitor (my monitor is capable of displaying a HD signal).

My standard dvd player shows an amazing picture on my HDTV. I am getting an HD receiver next week and just wondering if the picture will be getting any sharper. I am told it will, but how is possible for the eyes to see anything sharper than a dvd?
For you people watching HDTV…Do you really see a difference between HDTV (HD source) and watching a regular DVD?