For the PSU, Rosewill is store Branded type...Something you might want to steer clear from (unless someone else here has used them).
NCIX.com - Buy Corsair VX550W 550W ATX 12V 41A 24PIN ATX Power Supply Active PFC 120MM Fan - CMPSU-550VX In Canada.
Corsair Powersupply, to most people here is a religion :)
Going mid-low grade PSU is not always the best idea, if you can fit this into your budget, you should.
Ultra LSP550 550-Watt Power Supply - ATX, SATA-Ready, SLI-Ready, 135mm Fan in Canada at TigerDirect.ca
Or, for my chance to Plug an Ultra into the equation this is an alternate.
I use one myself, the 750W version, aside from tons of cables, its been reliable and quiet. Plus, I love the Lifetime warranty.
Good luck,
ST