Gaming Computer help

Solution
No chance. Low grade GPU and the APU has a more powerful integrated graphics. Plus, why would 750w be just enough for your system. Come on, even 350w is enough for your system. This will be far more powerful at the same price -

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.49 @ Amazon)
CPU Cooler: Cooler Master RR-T4-18PK-R1 70.0 CFM Rifle Bearing CPU Cooler ($27.99 @ Amazon)
Motherboard: MSI 970A-G46 ATX AM3+ Motherboard ($69.99 @ Amazon)
Memory: Kingston Fury Black Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM...
way to much power supply for that build. also if you want to go amd, forget about the apu's and get an fx cpu (6300 can be had for cheap). then take the money saved on the power supply and get a better video card.

also, get two (2) 4gb chips instead of one 8gb chip so you can use dual channel ram.
 
I still think the 750Ti is still slightly weak for the settings you want if you want around 60fps.
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.49 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($33.24 @ Amazon)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard ($84.99 @ Amazon)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.44 @ Amazon)
Video Card: Asus GeForce GTX 750 Ti 2GB Video Card ($149.99 @ Amazon)
Case: NZXT Source 210 Elite (Black) ATX Mid Tower Case ($49.99 @ Amazon)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($68.27 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($22.69 @ Amazon)
Case Fan: Corsair Air Series SP120 High Performance Edition 62.7 CFM 120mm Fan ($14.95 @ Amazon)
Total: $667.04
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-15 18:32 EDT-0400)
 

dottorrent

Honorable
No chance. Low grade GPU and the APU has a more powerful integrated graphics. Plus, why would 750w be just enough for your system. Come on, even 350w is enough for your system. This will be far more powerful at the same price -

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.49 @ Amazon)
CPU Cooler: Cooler Master RR-T4-18PK-R1 70.0 CFM Rifle Bearing CPU Cooler ($27.99 @ Amazon)
Motherboard: MSI 970A-G46 ATX AM3+ Motherboard ($69.99 @ Amazon)
Memory: Kingston Fury Black Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.44 @ Amazon)
Video Card: Gigabyte Radeon R7 260X 1GB Video Card ($119.99 @ Amazon)
Case: Cooler Master Elite 431 Plus (Black) ATX Mid Tower Case ($49.99 @ Amazon)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($79.00 @ Amazon)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($20.75 @ Amazon)
Case Fan: BitFenix BFF-SPRO-12025KK-RP 56.2 CFM 120mm Fan ($10.39 @ Amazon)
Total: $616.02
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-15 18:48 EDT-0400)

You can crossfire with another 260X later down the line.
 
Solution
The build you listed in OP was $800. Here is what I would suggest for $800.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($134.99 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.65 @ OutletPC)
Motherboard: Gigabyte GA-970A-D3P ATX AM3+/AM3 Motherboard ($69.99 @ Newegg)
Memory: G.Skill Ripjaws Z Series 8GB (2 x 4GB) DDR3-2400 Memory ($73.80 @ Newegg)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Drive ($58.99 @ NCIX US)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.99 @ Amazon)
Video Card: Club 3D Radeon R9 280X 3GB royalQueen Video Card ($239.99 @ NCIX US)
Case: Apevia X-DREAMER4-BL ATX Mid Tower Case ($59.99 @ Mwave)
Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($54.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($17.65 @ Amazon)
Case Fan: BitFenix BFF-SPRO-12025KK-RP 56.2 CFM 120mm Fan ($9.61 @ NCIX US)
Total: $802.64
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-20 03:12 EDT-0400
 
And here would be my Intel $800 build.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($224.74 @ NCIX US)
Motherboard: MSI Z97 PC MATE ATX LGA1150 Motherboard ($79.99 @ Micro Center)
Memory: G.Skill Ripjaws Z Series 8GB (2 x 4GB) DDR3-2400 Memory ($73.80 @ Newegg)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Drive ($58.99 @ NCIX US)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.99 @ Amazon)
Video Card: PowerColor Radeon R9 280 3GB TurboDuo Video Card ($181.10 @ Newegg)
Case: Apevia X-DREAMER4-BL ATX Mid Tower Case ($59.99 @ Mwave)
Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($54.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($17.65 @ Amazon)
Case Fan: BitFenix BFF-SPRO-12025KK-RP 56.2 CFM 120mm Fan ($9.61 @ NCIX US)
Total: $814.85
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-20 03:15 EDT-0400