That build seems great!
There's only a few things i'd change, and i've made these changes below;
PCPartPicker part list:
http://pcpartpicker.com/p/2ncPf
Price breakdown by merchant: http://pcpartpicker.com/p/2ncPf/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2ncPf/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($222.00 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI Z87-G43 Gaming ATX LGA1150 Motherboard ($124.99 @ NCIX US)
Memory: Corsair 8GB (1 x 8GB) DDR3-1600 Memory ($61.99 @ Amazon)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($104.99 @ NCIX US)
Video Card: MSI Radeon R9 270 2GB Video Card ($185.66 @ Newegg)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($89.99 @ Microcenter)
Power Supply: OCZ ZT 750W 80+ Bronze Certified Fully-Modular ATX Power Supply ($79.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($94.98 @ OutletPC)
Total: $994.57
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-20 06:16 EST-0500)
It's just under your budget, I had to compromise in GPU slightly, but you do gain 3 times the storage which is always nice. The GPU performance won't be too different, maybe take the AA down a notch, but that's about it
😀