latest reviewed build

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Yep, if you swap some components around you can move up to a GTX 770.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($224.99 @ Amazon)
Motherboard: Gigabyte GA-Z87-HD3 ATX LGA1150 Motherboard ($109.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($84.98 @ OutletPC)
Storage: Western Digital RE3 1TB 3.5" 7200RPM Internal Hard Drive ($50.94 @ Amazon)
Video Card: Asus GeForce GTX 770 2GB Video Card ($309.99 @ NCIX US)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($29.99 @ Microcenter)
Power Supply:...
Yep, if you swap some components around you can move up to a GTX 770.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($224.99 @ Amazon)
Motherboard: Gigabyte GA-Z87-HD3 ATX LGA1150 Motherboard ($109.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($84.98 @ OutletPC)
Storage: Western Digital RE3 1TB 3.5" 7200RPM Internal Hard Drive ($50.94 @ Amazon)
Video Card: Asus GeForce GTX 770 2GB Video Card ($309.99 @ NCIX US)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($29.99 @ Microcenter)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($71.30 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($99.98 @ OutletPC)
Total: $999.14
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-11 18:55 EST-0500)
 
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logainofhades

Titan
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PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Xeon E3-1230 V3 3.3GHz Quad-Core Processor ($244.30 @ SuperBiiz)
Motherboard: ASRock B85 Pro4 ATX LGA1150 Motherboard ($74.99 @ Newegg)
Memory: Team Dark Series 8GB (2 x 4GB) DDR3-1600 Memory ($74.98 @ OutletPC)
Storage: Western Digital RE3 1TB 3.5" 7200RPM Internal Hard Drive ($50.94 @ Amazon)
Video Card: Zotac GeForce GTX 770 4GB Video Card ($344.99 @ SuperBiiz)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($29.99 @ Microcenter)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($99.98 @ OutletPC)
Total: $995.15
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-11 19:19 EST-0500)