The modmytoys 8-pin distribution pcb will work nicely for you then.

If you fancy a bit more bling, Bitspower Xstations have plenty of different fan blocks.
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Why not just get a couple of these type things: http://www.overclockers.co.uk/showproduct.php?prodid=CB-030-AK&groupid=1929&catid=153 ?
Spot on if if did them all at 12v! Guess i could order 8…… (2 banks of 8 fans)