Well, went $5 over the high end on this build. Sorry, Canadian costs are a bit higher than in the states, and newegg seems to have fewer combos. For that price, you get a quad core AMD CPU with a GTX 460 PSU, a very nice combination, which should play any game at your resolution, last for several years and allow for future growth.
Case: Rosewill CHALLENGER Black Gaming ATX Mid Tower Computer Case for $45 http://www.newegg.ca/Product/Product.aspx?Item=N82E1681... This case is definitely inexpensive, but it got an average of 5 stars from Newegg. Also, if you purchase before the end of the month, you get a free cooler!
The basic build you need is about the same as eloric's.
I would buy an X3 Rana simply because it's cheaper and will perform just as well if not better then the Propus X4 6xx series gpu when gaming.
I would also spend $140-150 on a mobo that supports the newest AMD cpu's and has real xfire x8/x8 not x8/x4
You can buy 1600mhz CL7 ram for a $100 all year long.very fast ram.
The gpu choice of the GTX 460 is solid either 768mb of 1gb whatever your budget allows.
The best psu choice is something 650w no doubt the Corsair TX650 is rock solid but i'm not a fan of non-modular units.Antec True Powers often go on sale and are modular.They are higher quality then the OZC but the ModXtreme is far from a crappy unit actually they're very decent i have the 600w model.I also run a Corsair HX750 on another rig.
Hard to beat an Antec 300 for $50 as far as cases go they are pure quality.
The CM 690II's cost a bit more but offer a step up in features and are great quality as well.
With anything that people link in this thread http://ncix.com/ will pricematch any in stock item in Canada.
They also offer new sales everyweek the current one is set to change today.
My advice to you is to find the best deals on components you want and purchase them from NCIX even if you think the shipping will be too much it's worth it.
Since Newegg.ca's shipping cost are atrocious for the most part.