Yes it will, thermaltake makes very good powersupplies. I would not try adding two GTX’s though, the amps on all of Thermaltakes models are quite low at 18A or so which doesn’t provide a whole lot of clean power but it should be okay for what you have. For an SLI rig look into a Antec powersupply with at least 25A on the 12v rail and 550wts.
SLI Best Practices | NVIDIA Developer
that’s the link to the list of nvidia certified PSU’s, also about Tagan, that power supply should more than do, they are quality units and are very good for the price i think, overclockers sell tagan units (altough they may be a bit more expensive…but the customer service if anything goes wrong is worth the extra money) http://www.overclockers.co.uk/acatalog/Tagan.html