While it's nice that you have picked an aluminum case for $75, for $89 (
http://www.newegg.ca/Product/Product...82E16811112218) you could have an Lian Li. I highly recommend aluminum for it's lightness but if moving your computer around is not important, you can use the savings you get from a steel case that has more features.
I would also recommend a more powerful powersupply like others have mentioned. It's too bad you just missed out on a great Antec 750watt PSU @ NCIX's sale for $69.99.
For the videocard, I would go with the brand that gives you the best warranty and that's XFX with double lifetime.
I would actually build the computer at NCIX and price match everything to newegg (or anywhere else you find cheaper on shopbot.ca). NCIX has a $5.99 ground shipping on entire order promo now. Newegg will be shipping from the US and you get bundled extra fees for their higher shipping and built in UPS costs. NCIX will be easier to deal with for returns since it's in Vancouver.
Heck, if you can manage it, find similar components at Memory Express and price match NCIX and Newegg (they accept them) in the city (though I know how hard this is since Mem Ex has horrible selection).
Last night I bought a 5870 and ram and a PSU from NCIX pricematched to Newegg and saved about $75 just through pricematching and saving on shipping not to mention it'll arrive sooner (ships from Vancouver instead of California).