not much at that price range, this would be your best bet
Gateway DX4870-UR348 Core i3-2130 Dual-Core 3.4GHz 4GB 500GB
$325 http://www.geeks.com/details.asp?invtid ... -R&cat=SYS
$330 http://www.microcenter.com/product/4094 ... furbished#
MSI R7770-PMD1GD5 Radeon HD 7770 GHz Edition 1GB http://www.newegg.com/Product/Product.a ... 6814127687
$85 (w/ 16% promo deal "EMCYTZT3442, ends 5/16 and $20 MIR normally $125)
not bad for $415 at most, plus shipping. The only concern would be, that power supply would probably need a replacement after about a year or so.