I think you'll want the SP120 Performance as you have a fan controller, certainly out of the fans we have looked at so far.
I'm going to get some to test after the Scythes.
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Yeah it's looking that way.......can't justify £40 for x2 noctuas considering the corsairs are only a couple of db louder and about 1.5c difference (same speed but cranked up full kill the Noctuas) and the corsairs go for £19.99 free delivery for 2 fans.
Did you get some of the Corsair SP120 Performance in the end?
I haven't got round to doing anything with my fans yet :S