Posted by fp4

Here's $450:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Pentium G3420 3.2GHz Dual-Core Processor ($68.99 @ J&R)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($44.99 @ Newegg)
Memory: A-Data XPG Gaming Series 8GB (2 x 4GB) DDR3-1600 Memory ($62.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Amazon)
Video Card: Gigabyte Radeon HD 7790 1GB Video Card ($125.38 @ Newegg)
Case: Cougar Spike MicroATX Mini Tower Case ($34.99 @ Newegg)
Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($44.99 @ Amazon)
Total: $442.32
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-30 18:43 EST-0500)