Ah, you're American, that makes more sense. I stopped ordering from them after the third $500 package was just left on my welcome mat by UPS. But anyway...
Motherboard:
MSI P35 Neo-2. Personally, I'd recommend a Gigabyte or Asus P35 model, but this'll do the trick as well, I just wouldn't recommend it for any heavy-duty overclocking with Quad-core CPUs, but that's not in the picture at the moment.
Memory:
Corsair XMS2 4GB. You could get by with 2 GB of memory, more than likely, but this stuff will last you well into the future, and support mild overclocking as well. Shouldn't be any compatibility issues with popular motherboards, either.
PSU:
Corsair VX550. Seriously, you don't need 600W. I'm using the 450W version of this, and it's powering the second system in my signature, and it's not even breaking a sweat. The 550W version has two PCI-E power plugs, which might be useful if you find yourself running a card that needs them, but the 8800GT you listed doesn't need it. Otherwise, save $20 by getting the VX450 instead.
Adding on that video card (nice price, I'd say) for $200 will put you around $500.