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?
whats your current spec? a Q6600 goes for £75 second hand in the members market, which your only 28 posts from getting access too.
E8400
top of the range P45 board
4Gb Kingston HyperX
4890
CPU watercooler, with a total overkill 120.3, just for CPU
keep it, that will last untill the new tech is released easily.
What speed is the cpu running at?
Maybe for some foundation work, buy the psu and a SSD
Keep what you have, buy the psu.
And then see what sandybridge brings and go from there?