CPU: Intel Pentium G645 2.9GHz Dual-Core Processor ($59.99 @ Microcenter)
Motherboard: ECS H61H2-M12 Micro ATX LGA1155 Motherboard ($29.99 @ Newegg)
Memory: G.Skill NS 4GB (2 x 2GB) DDR3-1333 Memory ($19.99 @ Newegg)
Video Card: MSI Radeon HD 7770 GHz Edition 1GB Video Card ($109.99 @ NCIX US)
(Prices include shipping, taxes, and discounts when available.)
CPU won't bottleneck, as GPU is mid-end
Don't need nice MOBO at this price point, most H61 MOBOs have same features anyways
Better GPU due to CPU downgrade, only difference in CPUs is clock rate, which isn't worth it at this price point.