Justinator,
Yes, 700W is more than you need. 650W is the absolute highest you should consider if you
don't want to keep open the option of dual high-end GPUs. You will use around 50% of 650W at load, which makes 650W actually slightly more powerful than needed. You will be perfectly fine with 550W too. So, you can also get away with less than 150 CAD for case and PSU bought separately. I would get these:
PSU:
http://www.newegg.ca/Product/Product...82E16817151096 $80 The way I see it, Seasonic is the best PSU manufacturer. Extremely positive reviews across the board, silent operation, high efficiencies, very good power quality.
Case:
http://www.newegg.ca/Product/Product...82E16811133094 $40 (too bad newegg.ca doesn't have NZXT gamma available - over 300 votes, 5 star)
I would take this case over Antec 300, as it's cheaper and has 2 top fan slots. Your GPU cooler will be blowing half of the hot air to
within your case, so the holes on the top will allow that air to rise out naturally even if you don't have fans in them. This case only comes with 1 rear fan, you'll want another 120mm fan on the front, e.g.
http://www.newegg.ca/Product/Product...82E16835185057
Since you're building a
gaming PC, an SSD may not be worth your money. You're on a budget so you could spend that money to improve other aspects, such as getting a better case (fan filters, more fans, noise absorbing padding, more room, better build quality and looks, whatever). And it would allow you to stay below your budget.
Finally, there's a great rebate deal on XFX 6950 2GB cards. 30USD off from all of them. Get this:
http://www.newegg.ca/Product/Product...82E16814150548 Dual-fan, factory overclocked, limited lifetime warranty.