This could probably suffice for a few years, and would be open for upgrades, as well as if you OC the gpu it will be even better for gaming
PCPartPicker part list:
http://pcpartpicker.com/p/PsmGdC
Price breakdown by merchant: http://pcpartpicker.com/p/PsmGdC/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($187.89 @ OutletPC)
Motherboard: MSI Z97 PC MATE ATX LGA1150 Motherboard ($89.99 @ Micro Center)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($79.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI GeForce GTX 760 2GB TWIN FROZR Video Card ($184.99 @ Newegg)
Case: Rosewill CHALLENGER ATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($49.99 @ Newegg)
Total: $687.81
Prices include shipping, taxes, and discounts when available