Without OS its going to be tough yet achievable , here you go ( slightly over your budget ) : PCPartPicker part list:
http://pcpartpicker.com/p/X7PpVn
Price breakdown by merchant: http://pcpartpicker.com/p/X7PpVn/by_merchant/
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor ($69.98 @ OutletPC)
Motherboard: ASRock H81M-HDS Micro ATX LGA1150 Motherboard ($49.99 @ Micro Center)
Memory: Team Vulcan 8GB (2 x 4GB) DDR3-1600 Memory ($67.99 @ Newegg)
Video Card: EVGA GeForce GTX 750 Ti 2GB FTW ACX Video Card ($129.99 @ Amazon)
Case: Cougar Spike MicroATX Mini Tower Case ($29.99 @ Mwave)
Power Supply: EVGA 430W 80+ Certified ATX Power Supply ($34.99 @ NCIX US)
Total: $382.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-23 20:25 EDT-0400