ADDITIONAL COMMENTS: I'll list what I already have and you criticize and recommend! I'll be using this computer mainly for gaming. This is my first build and I'm a bit overwhelmed with all the specs and variety of builds. I have no experience whatsoever so I'll have to really read up on what I'm doing, despite as impatient as I may be.
So you basically have ~700 bucks to choose me a PSU, CPU and MOBO (I know I'm probably forgetting something)... possibly more or less depending on what I'm recommended to change in the parts mentioned.
That puts you at $1337.38 before shipping and taxes.
Finally, since your are planning on buying a new monitor, I'd like to point out that since they last so long, they are the best place to sink as much as you can afford on them. Odds are that in 7 years, the monitor you buy today will be one that you can still use. Odds are the the computer you build will be obsolete. So a recommendation that would cost you $50 more is:
ASUS VW246H Black 24" 2ms(GTG) HDMI Widescreen LCD Monitor - Retail $239.99 http://www.newegg.ca/Product/Product.aspx?Item=N82E1682...
OK here's the deal. If your serious about giving SLI or Crossfire a go later on, then forget that Antec 300 (Illusion). It's a great case for a single card set up, but it's not for a dual card set up. This case down below (CM 690) has much more room for a dual vid card set up, not to mention it has superb cooling/airflow. The board down below is what you want also. It allows for both SLI or Crossfire, and it comes with easy over clock tools, and a bunch of other goodies. No reason you should be limited to just Crossfire on a mobo. The only time you would need an i7 860 is if you do Adobe professionally, video editing for a living, etc.... but not for gaming. If this is for gaming...the go with the i5 750. That's what o/c is for. This h/s down below comes with a small tube of thermal paste, but if you plan on doing any hard core o/c go to the NCIX site and order a tube of Arctic Cooling MX-2 thermal compound for around $9 CAD. I also included the o/s in this build.
*btw nice choice on that gtx 275. Those cards rock!
Based upon the fact that you aren't going to have a monitor capable of 2560x1600, you should be able to run most games at good performance at 1920x1200 (or 1920x1080). You'll get most games at awesome performance with an SLI configuration.