it is not the same price in canada there is almost a 30$ difference
Since your link to the XFX unit came from the Newegg website in the US, I assumed you lived in the US. If there is a $30 difference in Canada, then go with the XFX unit.
550W-650W would be enough. Make sure you have at least 40 Amps on the 12V rails of the power supply.
I have no idea how to check that will this psu work http://www.newegg.com/Product/Product.aspx?Item=N82E16817207014&nm_mc=OTC-pr1c3grabb3r&cm_mmc=OTC-pr1c3grabb3r-_-Power+Supplies-_-XFX-_-N82E16817207014&scpid=7&scid=scsho5481154
Sure, it will, But here's a better one for the same price. The EVGA SuperNOVA G2 750W is 80 PLUS GOLD Certified and will give you an extra 100W for future upgrades. The full Modular design will make cable management a dream and the unit is backed by a pretty nice 10 year warranty.
Whilst the EVGA SuperNOVA G2 750W is nice to have, it is not necessary if you plan to always get a single dedicated gpu. 750W is more for crossfire or SLi. 650W is already enough for a single gpu setup. If the price is cheaper than the 650W then of course the 750W is a better deal.
it is not the same price in canada there is almost a 30$ difference
Since your link to the XFX unit came from the Newegg website in the US, I assumed you lived in the US. If there is a $30 difference in Canada, then go with the XFX unit.