I built a nearly identical system to this for my Dad's girlfriend. With some faster RAM and an SSD, that baby will fly.
I used this ram
. Someone has already suggested it. And it is cheaper on newegg than ncix.
Maybe you can find a cheaper PSU to make up the difference in price of the RAM. http://www.newegg.ca/Product/Product.aspx?Item=N82E16817371030
this one goes on sale frequently (at least on the US site) and is nice quality and more than enough power even if you want to add another card for hybrid xfire later.
I highly recommend adding an SSD as soon as you can afford one. I put a 90GB Vertex 3 in her build and, for booting and opening programs, her rig at stock is faster than my sig rig.
I suppose for better gaming performance, you could always go with the A10 for better graphics and higher cpu clock. But I can't vouch for how the A8 gaming performance is to begin with. Also, there is always the possibility of overclocking with an aftermarket cooler or hybrid xfire with either APU.