Doesn't really matter is it's modular or not. As long as it can power...
4xHDD's, Swiftech 18W pump, 2x 240mm fans, 1x 140mm fan and 3x 120m, oh, also the above spec.
Also, would it be viable to just purchase a 775 Quaddy and new GPU and PSU, and wait and see what 'sandybridge' brings?