I have to go to bed now. :C
But could someone still find me a AM3 motherboard cheaper than ethan's and not a crappy one?
I suggested the motherboard I did because it had Crossfire support (8x, 8x) which was good for upgrades, but it doesn't sound like you'll be doing anything that will require such heavy graphics rendering. I'll cut it down a bit.
Also, that other $400 build had an Athlon. Old technology and framework will make it worse regardless of the clock speeds.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157176Brand is ASRock, a division of ASUS who make great computer components.
Won't be as good as the previously suggested motherboard but still has 2 PCI-E slots, that would run in 4x, 4x. That's only going to affect high end things and wouldn't affect anything like gaming that much.
Also, this motherboard only supports DDR3 1600,
so I found you some more RAM.I am a loving idiot, this is the RAM I selected first off. Is there anything you have against it? Cause there is more 1600 you could choose from.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104166Kingston is the single best brand of RAM, and make great sticks. Cheaper, too.