2.6C would get you to 3250@250MHz bus (CPU:RAM 1:1, QDR1000, DDR500). And you could try to overclock higher than that by pushing the memory a bit farther.
2.8C would do 3500@250MHz bus if you have reasonably good luck and a large enough cooler. That water cooling settup should do.
I wouldn't waste money on that Antec power supply. A Fortron 400W is nearly as powerfull. Instead, I'd go with the Fortron 530W unit at newegg, which is more powerfull than an Antec 550W while costing less than an Antec 430W. Wow! And the build quality is top notch!
Of course, 36GB isn't much, you'd do yourself a favor by having a cheaper large capacity IDE drive for storage, using the Raptor for programs.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>