Build looks pretty good. Some concerns, but not show stoppers:
* The RAM selected needs to run at 1.65v to attain 1866 mHz speeds, per manufacturers specs. I don't like to have my RAM run above DDR3 specs (1.5 volts), but that doesn't mean that it won't work, just a concern.
* The case is good, but only supports 1 x front USB 3.0 ports. For the same $ the Corsair 300R (better case, IMHO) supports 2 x front USB 3.0 ports. Not a show stopper, just something to conisder.
* PSU is good, but not great. It generally is a good PSU, but has been getting some iffy reviews from individuals (yeah I know not reputable), but something to conisder.
With that out of the way, here is my sub $650 build, with similiar parts, except for the Mobo, RAM, GPU, Case, & PSU:
[url=http://pcpartpicker.com/p/TvYE]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/TvYE/by_merchant/]Price breakdown by merchant[/url] / [url=http://pcpartpicker.com/p/TvYE/benchmarks/]Benchmarks[/url]
[b]CPU:[/b] [url=http://pcpartpicker.com/part/amd-cpu-hdz965fbgmbox]AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor[/url] ($94.84 @ Amazon)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/asus-motherboard-m5a97r20]Asus M5A97 R2.0 ATX AM3+ Motherboard[/url] ($84.99 @ Amazon)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/gskill-memory-f314900cl9d8gbsr]G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory[/url] ($60.30 @ Newegg)
[b]Storage:[/b] [url=http://pcpartpicker.com/part/seagate-internal-hard-drive-st500dm002]Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive[/url] ($55.22 @ Amazon)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/powercolor-video-card-ax78702gbd52dhppv3e]PowerColor Radeon HD 7870 XT 2GB Video Card[/url] ($235.66 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/corsair-case-300r]Corsair 300R ATX Mid Tower Case[/url] ($49.99 @ Newegg)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9]XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply[/url] ($63.99 @ NCIX US)
[b]Total:[/b] $644.99
[i](Prices include shipping, taxes, and discounts when available.)[/i]
[i](Generated by PCPartPicker 2013-04-28 01:19 EDT-0400)[/i]
A little less GPU and a better CPU:
[url=http://pcpartpicker.com/p/Tw43]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/Tw43/by_merchant/]Price breakdown by merchant[/url] / [url=http://pcpartpicker.com/p/Tw43/benchmarks/]Benchmarks[/url]
[b]CPU:[/b] [url=http://pcpartpicker.com/part/amd-cpu-fd6300wmhkbox]AMD FX-6300 3.5GHz 6-Core Processor[/url] ($135.34 @ Amazon)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/asus-motherboard-m5a97r20]Asus M5A97 R2.0 ATX AM3+ Motherboard[/url] ($84.99 @ Amazon)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/gskill-memory-f314900cl9d8gbsr]G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory[/url] ($60.30 @ Newegg)
[b]Storage:[/b] [url=http://pcpartpicker.com/part/seagate-internal-hard-drive-st500dm002]Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive[/url] ($55.22 @ Amazon)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/msi-video-card-r78702gd5toc]MSI Radeon HD 7870 GHz Edition 2GB Video Card[/url] ($190.00 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/corsair-case-300r]Corsair 300R ATX Mid Tower Case[/url] ($49.99 @ Newegg)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9]XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply[/url] ($63.99 @ NCIX US)
[b]Total:[/b] $639.83
[i](Prices include shipping, taxes, and discounts when available.)[/i]
[i](Generated by PCPartPicker 2013-04-28 01:26 EDT-0400)[/i]