Raidmax is not known for their good power supplies. It is a combo, so you still have to build it.
Why not just buy the parts separately? Only $632 and you get an OS, all from newegg.
PCPartPicker part list:
http://pcpartpicker.com/p/vtY8xr
Price breakdown by merchant: http://pcpartpicker.com/p/vtY8xr/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: MSI 970A-G43 ATX AM3+ Motherboard ($54.99 @ Newegg)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Newegg)
Video Card: XFX Radeon R9 270 2GB Double Dissipation Video Card ($159.99 @ Newegg)
Case: Thermaltake Versa H21 ATX Mid Tower Case ($47.98 @ Newegg)
Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($34.99 @ Newegg)
Optical Drive: Asus DRW-24F1ST DVD/CD Writer ($19.99 @ Newegg)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($101.98 @ Newegg)
Total: $632.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-16 10:00 EDT-0400