PCPartPicker part list:
http://pcpartpicker.com/p/tTBzhMPrice breakdown by merchant:
http://pcpartpicker.com/p/tTBzhM/by_merchant/CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor ($74.99 @ Newegg)
Motherboard: MSI Z97 PC MATE ATX LGA1150 Motherboard ($89.99 @ Newegg)
Memory: Pareema 4GB (1 x 4GB) DDR3-1333 Memory ($37.99 @ Newegg)
Video Card: MSI GeForce GTX 750 Ti 2GB TWIN FROZR Video Card ($119.99 @ Newegg)
Power Supply: EVGA 430W 80+ Certified ATX Power Supply ($30.98 @ Newegg)
Total: $353.94
Prices include shipping, taxes, and discounts when available
Preliminary part list. Now, hold your horses, $350, that is overbudget, but check the graph at the bottom of the PCPartPicker and you'll see that it fluctuates quite frequently with the total price shown to dip right to at $300. (ignore the early ~$200 that was before Pareema was first sold online)
Still, optimizations can be done if you already have RAM you can use, but if its DDR2, it wont work.