Here are 2 motherboards that will work for the cpu and the ram that you want
asus board http://www.komplett.ie/k/ki.aspx?sku=490260
gigabyte board http://www.komplett.ie/k/ki.aspx?sku=575117
For the video card go with a 5770 or even a lesser model. The 5850 is overkill for pc games since most pc games are just console ports with console graphics. Wait until the next-gen consoles come out before you buy the top of the line video card.
also i agree with twistedpixel get a quality psu, this is one area not to cheap out on the computer.