CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor ($74.99 @ Newegg)
Motherboard: MSI Z97 PC MATE ATX LGA1150 Motherboard ($89.99 @ Newegg)
Memory: Crucial Ballistix 4GB (1 x 4GB) DDR3-1600 Memory ($39.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: EVGA GeForce GTX 750 1GB Video Card ($97.99 @ NCIX US)
Case: Cooler Master Elite 430 ATX Mid Tower Case ($27.99 @ Newegg)
Power Supply: Antec 450W ATX Power Supply ($37.99 @ Amazon)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($13.99 @ Newegg)
Total: $417.91
If you want to spend the extra 200$ upgrade the ram to 8gb upgrade the PSU to a 750watt for future upgrades. and maybe spring for a 750ti or 760, or go with another mobo.
Honestly you can do alot with that budget, Go check out PCPARTPICKER.com