Mattus said:Reckon you could shave a bit more offYou could lose the DVD drives by running a network boot (I assume you were thinking of live CDs?) and with a bit of trickery I reckon each of those PSUs would just about support two systems.
I was thinking Live CD and I did think about Netowork Boot but I don't have the expertise

And thats a good point Get the 550W or a bit but only buy 5

Actually to be honest if I was gonna do that I'd phone up *unnamed company* and see what kind of a deal they'd do me seeing as I would be about to give them £4.5K