You are bottle necking your GPU with buying an AMD athlon x3.. Go for the Phenom x4 or intel i3-2100... or heck i5-2500k!
I agree, Get a am3+ board so you can possibly buy the new bulldozer cpu's....
Your motherboard is micro atx so your graphics card might stick out a bit...
You Case is good,
Get a better PSU... May i recommend: http://www.newegg.com/Product/Product.aspx?Item=N82E16817207014
it's 80+ and single rail.... Much better then the rosewill one.... And xfx psu's are made by seasonic and seasonic is the top 3 psu makers!
good luck with your build...!