First PC build, Second post(poor Info on the first)

[GoBigRed]

I am on a $1k budget and here are the specs:

OS: Windows 8.1 Pro 64-bit OEM
GPU: EVGA GeForce GTX 760 ACX
CPU: Intel Core i5-4670K
Motherboard: ASRock Z87 PRO3
Memory: 8GB G.Skill DDR3-1866 RAM Kit (2 x 4GB)
Solid-State Drive: SanDisk Extreme II 120GB SSD
Hard Disk Drive: WD Caviar Blue 7200RPM, 500GB HDD
Optical Drive: Lite-On DVD-R
Case and Power Supply: Thermaltake VM54521N2U Mid-Tower w/ 450W PSU
(I KNOW THIS CASE WON'T WORK)

*NOTE: I am only using 1 monitor(probably 1920x1080) and I am kinda flexible for about 1-2 hundred dollars.

Should I upgrade to the gtx 760 SLI, GTX 770 (SLI of this also), or any ideas. I want to run Arma on Very High at reasonable FPS.

UPDATE!!! Since I am fairly new to PC gaming I would like to know of a better case, I don't need the fanciest case, just something with good airflow/dust prevention and power supply doesn't have to be included in the case.

 

[lp231]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($129.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard ($114.98 @ SuperBiiz)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($79.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: EVGA GeForce GTX 760 4GB Video Card ($299.99 @ Amazon)
Case: NZXT Source 220 ATX Mid Tower Case ($44.99 @ TigerDirect)
Power Supply: Corsair Professional 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($89.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($94.98 @ OutletPC)
Total: $961.84
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-30 15:09 EST-0500)


PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor ($179.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: ASRock Fatal1ty Z87 Killer ATX LGA1150 Motherboard ($114.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($79.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: EVGA GeForce GTX 760 4GB Video Card ($299.99 @ Amazon)
Case: NZXT Source 220 ATX Mid Tower Case ($44.99 @ TigerDirect)
Power Supply: Corsair Professional 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($89.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($94.98 @ OutletPC)
Total: $991.85
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-30 15:11 EST-0500)