Newbie needs advice

[kboss]

I just ordered a Dell e310 scratch and dent from their outlet to use as a media gateway.It it has a 2.8ghz p4 processor,160gig hd,dvd burner,and just the dell integrated audio and graphics cards. I have dishnetwork 211 hd receiver with a sony 52 in. rear proj. t.v. and home theater system. I would like to have pvr capabilities,be able to stream my music and photos from my main computer through my wireless router and surf the net on my tv. The computer is coming with MCE installed.I really need advice on tuner/video cards also will I need a better sound card?

Any help would be greatly appreciated,Thanx