This is what I'd look at:
[PCPartPicker part list](http://ca.pcpartpicker.com/p/10WEq) / [Price breakdown by merchant](http://ca.pcpartpicker.com/p/10WEq/by_merchant/) / [Benchmarks](http://ca.pcpartpicker.com/p/10WEq/benchmarks/)
**CPU** | [AMD FX-6300 3.5GHz 6-Core Processor](http://ca.pcpartpicker.com/part/amd-cpu-fd6300wmhkbox) | $119.99 @ Canada Computers
**Motherboard** | [Asus M5A97 R2.0 ATX AM3+ Motherboard](http://ca.pcpartpicker.com/part/asus-motherboard-m5a97r20) | $95.99 @ Newegg Canada
**Memory** | [Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory](http://ca.pcpartpicker.com/part/corsair-memory-cml8gx3m2a1600c9b) | $64.99 @ Newegg Canada
**Storage** | [Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive](http://ca.pcpartpicker.com/part/western-digital-internal-hard-drive-wd5000aaks) | $43.99 @ Amazon Canada
**Video Card** | [Asus GeForce GTX 660 2GB Video Card](http://ca.pcpartpicker.com/part/asus-video-card-gtx660dc2o2gd5) | $189.99 @ NCIX
**Case** | [Corsair 200R ATX Mid Tower Case](http://ca.pcpartpicker.com/part/corsair-case-200r) | $49.99 @ NCIX
**Power Supply** | [Corsair Builder 430W 80 PLUS Bronze Certified ATX12V Power Supply](http://ca.pcpartpicker.com/part/corsair-power-supply-cx430) | $44.99 @ Newegg Canada
**Total**
| Prices include shipping, taxes, and discounts when available. | $609.93
| Generated by PCPartPicker 2013-05-29 01:35 EDT-0400 |
* CPU the best you can get at this price.
* Mobo supports front USB 3.0 ports (I have a case that supports this option below).
* RAM has LOW PROFILE heat spreaders and runs at stock voltage of 1.5v.
* GPU is one of the better ones in this price range (trades blows with 7850 at stock settings).
* Case has 2 x front USB 3.0 ports and has good build quality.
* PSU supports the GTX 660 or 7850. If you want more wiggle room I would spend a bit more and get a 500-550w quality PSU from Antec, Corsair, Seasonic, PCP&C, and XFX.