I second that, go with watercooling. Although, I think you could probably get by with air on this. O, and welcome to MacMod. Glad to have you on the site.
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"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt