I don't know if the monitor is supposed to be included in the budget.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor ($64.29 @ Amazon) Motherboard: Gigabyte GA-H81M-H Micro ATX LGA1150 Motherboard ($47.98 @ Newegg) Memory: Corsair XMS3 4GB (1 x 4GB) DDR3-1333 Memory ($27.99 @ Newegg) Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($52.89 @ OutletPC) Video Card: EVGA GeForce GTX 970 4GB ACX 2.0 Video Card ($334.98 @ SuperBiiz) Case: NZXT Source 210 (Black) ATX Mid Tower Case ($31.98 @ OutletPC) Power Supply: EVGA 500W 80+ Certified ATX Power Supply ($24.99 @ Newegg) Total: $585.10 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2014-12-10 04:48 EST-0500