Nerdtastic:davidcole: Why not look at a AMD A8 APU (cpu + GPU) on a AM3 Motherboard (or for slightly dearer an intel i3/i5.
+1 for the APU (although not restricted to what one you get)
I am personlly looking at building an HTPC with an APU. The server sits under the TV running Plex (maybe XBMC front?), adding a discret graphics card in crossfire with the APU. This allows me and my brother to play multiplayer with me o the desktop and him on the TV.
Other TV's can be joined with another mini PC running XBMC that grabs it all off the server.
I hope to get this ordered and built in a couple of weeks.
If plex is on the server, xbmc wont read it (as of frodo) but Plex Media centre is a GUI based off xbmc anyway which talks well to a plex server....or a raspberry pi running rasplex.