ok mate, as you can see from my sig, i have pretty much the same rig as what you're buying, but i have a few tips....
Sorry for my currency translations, apart from being an avid trailer park boys fan, i know nothing of canada, so my currency conversions are UK Â£ to USD $.
First off, the M2N-E is NOT AN SLI BOARD. You'll need the M2N-E SLI for that, or as someone above said, you could pay more for the M2N 32 SLI, it is a lot better, and uses the NF590 SLI chipset, with full 16x2 bandwidth for PCIe cards in SLI mode.
The asus M2N-E has a few little quibbles that you will need to consider, 1st, memory voltages are capped at 1.95 V, which means high performance memory is out, check the qualified vendor list BEFORE you buy your memory, and dont take the advice of all the Intel fanboys here telling you to buy Ballistix and all that that runs at 2.2V, it simply wont work wiiht this board. This is the best i coudl find that will run at the spcified voltages on this motherboard (and appears in the qualified vendor list) i'm sure googling it will find you a canadian supplier.
As for graphics, i first of all ran a 7600GT with this board, until it died, (i'm not going into it here, too embarrassing, needless to say, i RMA'd it) and when i got the credit note back, i bought the 7900GS from gainward (standard clocks are 450/660 - gainward clocks are 500/700, i overclock it VERY stably with the stock gainward dual slot cooler to 655/827 with NO stablility issues, 19k 3Dmark03 scores). My advice, 7600GT will be fine, and at 1024*768, you will be able to run any game with most if not all settings, but for an extra Â£25 you coudl get the 7900GS which in my opinion is worthy of 7950GT price tag, its THAT GOOD. Check this news article for some overclocking benchmarks with this card, and even some comparisons to the 7600GT... http://www.theinquirer.net/default.aspx?article=34406
Overall, you have a good system here, i hear everyone saying that C2Duo is all the rage, but for this price range, mid-high end comparisions dont really matter, you COULD spend Â£500 ($1000) on a processor which will be beaten next year, or like me you could spend Â£120 ($240) on a 4200+ that is coolasfuk and overclocks nicely. C2Duo CPUs for this price are fairly similar in specs, thereisnt much between them.
If you get the M2N-E mobo, opt for a 7900GS over a 7600GT, (getting the SINGLE slot mobo forces you to get a good gfx card NOW, rather than pointlessly spending money on a new one later, for relatively little increase in performance)
Otherwise, take a look at the M2N-E SLi, which as far as i belive has the voltage cap removed (pls check this yourself though, the ASUS member forums are a good place for this) but definitely stick with ASUS, their motherboards are rock solid, (as their slogan goes) and the software bundles for overclocking are more than adequate in my opinion for even beginners to get the most out of their hardware.
Any questions, give me a shout...