Check out the last System Builder Marathon here at TomsHardware.http://www.tomshardware.com/reviews/build-a-pc-overclock-athlon-ii-x3,2811.html
That should be able to what you just asked for with its GTX 460. It may actually be a bit cheaper, now, too - RAM prices have dropped further, and I believe that AMD reduced the prices on their Athlon II lineup when they released a couple refreshes.
I just checked out Shinobi's builds, and they don't look half bad. Nicely done.
I'd go with his $450 setup if you want more CPU power. If you want a bigger GPU, go with the SBM Setup.