$1000 to $1500 CDN gaming rig

So I’ve finally been convinced to get a new computer, since my current one is crashing and having all sorts of issues. Also I’ve officially been titled “Needs a new computer” in my guild...  

APPROXIMATE PURCHASE DATE: This week possibly next week
BUDGET RANGE: ~$150CDN Before / After Rebates
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming (SC2, Global Agenda, Bad Company 2, Aion, and... school work)
PARTS NOT REQUIRED: keyboard, mouse, speakers, OS
PREFERRED WEBSITE(S) FOR PARTS: I’ll be buying all of my parts from http://www.memoryexpress.com but I’ll be price matching some/all of my components from other CDN sites like http://www.newegg.ca
COUNTRY OF ORIGIN: Canada
PARTS PREFERENCES: None
OVERCLOCKING: Maybe
SLI OR CROSSFIRE: No
MONITOR RESOLUTION: Depends on monitor
ADDITIONAL COMMENTS: Just want something that’s stable and is able to play all of the current games out there

What I have so far as of 7/18/10; all of these parts are available at memexpress, so I can just drop buy and pick it up (I’d rather not wait for shipping).

MOBO: Gigabyte GA-890FXA-UD5 w/ DualDDR3 1333, 7.1 Audio, Dual Gigabit Lan, USB3.0, 1394, PCI-E, CrossFireX ($209.99 http://www.memoryexpress.com/Products/PID-MX28931(ME).aspx, $189.99 at newegg.ca)
CPU: Phenom™ II X4 955 Black Edition 3.2GHz w/ 8MB Cache (Retail Box, Socket AM3) ($179.99 http://www.memoryexpress.com/Products/PID-MX26993(ME).aspx, $169.99 at newegg.ca)
GPU: Sapphire Radeon HD 5850 1GB GDDR5 PCI-E w/ Dual DVI, HDMI, DisplayPort ($319.99 http://www.memoryexpress.com/Products/PID-MX28266(ME).aspx )
RAM: Patriot Extreme Performance Viper II Series DDR3 4GB (2 x 2GB) PC3-12800 Low Latency Dual Channel Kit ($124.99 http://www.memoryexpress.com/Products/PID-MX25527(ME).aspx )
Case: Cooler Master Storm Sniper Case ($179.99 http://www.memoryexpress.com/Products/PID-MX23166(ME).aspx#NA, $159.99 at newegg.ca)
Power: Corsair TX 650W Power Supply w/ 120mm Fan ($79.99 http://www.memoryexpress.com/Products/PID-MX18780(ME).aspx )
Hard Drive: SEAGATE 1.5TB Barracuda 7200.11 SATA II w/ 32MB Cache ($89.99 http://www.memoryexpress.com/Products/PID-MX21884(ME).aspx )
Optical Drive: Samsung SH-S223B 22x SpeedPlus™ DVD-Writer, SATA, Black, OEM ($19.99 http://www.memoryexpress.com/Products/PID-MX25096(ME).aspx )
Monitor: Looking to get a 22’’ or maybe a 23’’ really depends on the price, also might want to get two screen for school work.

Current cost after price matches & mail-in rebates: $1154.92 CDN, with one monitor I’m probably sitting around $1400 CDN mark.

Thanks in advance for your help & input