I've never heard of the brand but if those numbers for the +12v rails are anything close to reality then you should be fine to crossfire HD5750s. FYI his processor at 2.3 is going to bottleneck 2 HD5750 so upgrading that should be the next thing to do. If it is a 790 chipset then likely it can handle AM3 chips.
The 955 is actually usually the better buy. They are the same processor just with different stock speeds. If you are going to OC anyway(you should) there's no reason to spend more for the 965. Try to get one with the newer C3 stepping.
ATI Radeon™ HD 5750 System Requirements
450 Watt or greater power supply with one 75W 6-pin PCI Express® power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
The published specs are entirely useless as usual. The HD5750 doesn't even use its power connector(stays under 75w during normal usage.) It only tends to go above that during stress testing and then it tops out at around 80w.
Im from Faroe island, and the pricese are not near anything like newegg, or any other american website. and the Publihed specs doesnt really count, it depends more on if its a "Quality" or "Not Quality".... as far as i know. (:
My problem is. I never even head the name "TITAN" on a PSU and i dont know if its quality or not, and im not really sure how to see if its a good PSU or not 0.o