Re: Intel GMA950 or Nvidia mcp73
You said its for office work. Amd is even good for gaming, intel chips just overclock higher and perform slightly faster at stock speeds than amd's chips, but amd owns the low-mid end dual core market, with great performing chips at a great price. If you take overclocking out of the picture, the chips are about head to head.
A low end video card will help overall system performance, and make movie playback smoother, both standard and hi-def.
You dont really even need a dual core for what the pc will be used for, a sempron will handle the stuff just fine and even some multitasking when paired up with 2gb of ram. Dual core will be much better though.
Folding Rig/File Server
M775 | E1200 | Foxconn P9657AB | Dual 8800GT | Antec NeoHE 500 | Barracuda 80GB | Wintec Ampx