Ah right, gotcha. Lets say its for a media PC - HiDef video editing/playback. Blu-Ray DVDs, music/video streaming. No games at all. What would be best here?

Running on Vista Home Premium (MCE), 4GB DDR2 (or 3)

Edit: I'll be recording TV shows too (maybe 2 at a time) not HD yet though :-( but lets assume that OTA HD will be in the UK soon and I'll want to record that.

Thanks!