Is this a good $800 Budget Build

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($187.88 @ OutletPC)
Motherboard: ASRock H97M PRO4 Micro ATX LGA1150 Motherboard ($69.99 @ Newegg)
Memory: Crucial Ballistix Sport XT 8GB (2 x 4GB) DDR3-1600 Memory ($67.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.88 @ OutletPC)
Video Card: XFX Radeon R9 280X 3GB Double Dissipation Video Card ($204.99 @ Newegg)
Case: Enermax OSTROG ATX Mid Tower Case ($39.99 @ Directron)
Power Supply: EVGA SuperNOVA NEX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($39.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($13.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($88.98 @ OutletPC)
Total: $763.68
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-28 13:28 EST-0500
 
Solution
The PSU in the above build is of bad quality as it uses group regulated +12 volt rail. This one would have much more bang for your buck, with a 290 and an SSD:
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($159.99 @ Micro Center)
Motherboard: Asus H81M-D PLUS Micro ATX LGA1150 Motherboard ($44.49 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Storage: Sandisk Solid State Drive 128GB 2.5" Solid State Drive ($52.37 @ NCIX US)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($52.99 @ Amazon)
Video Card: Asus Radeon R9 290 4GB DirectCU II Video Card ($244.99 @ NCIX US)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($32.99 @ Micro Center)
Power Supply: SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply ($49.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.89 @ Directron)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($92.99 @ NCIX US)
Total: $814.68
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-28 14:45 EST-0500