I built almost the same exact rig you did (q6600, biostar tforce tp45HP, radeon 4670, 4 gb patriot 800mhz DDR2 ram (2x2), seagate 500 gb 7200 rpm HD, samsung dvd burner with lightscribe) and it was rolling along just fine with a generic POS 550 Rhycom psu I had lying around. The corsair PSU you're looking at should cover your needs...HOWEVER:
This is the Antec PSU I'm currently using. It's quiet, semi-modular, pulls 650 watts, ships free, and is 50 dollars off right now (140 to 90 dollars - cheaper than the corsair you mentioned). The extra headroom will be nice if you plan on upgrading in the future. I recommend this psu instead of the corsair, especially at this price.