I'm just thinking ... what are you running on this system? More than just this board? Have you profiled it? What can you separate out? Are you using vBulletin for other sites too?
Furthermore, you don't always need to build'em huge, like this 8Px12G and with 15Krpm disks. You can fit a lot in 2.5" bays with 5400-7200rpm disks these days, and then just bump up your RAM to compensate the reduced spindle. There are 2.5"x9.5mm drives at 640GB (5400rpm) and 500GB (7200rpm), as well as 2.5"x12mm drives at 1TB (5400rpm). You can fit a nice 4Px8G with four (4) 2.5" drives in Mini-ITX/Micro-ATX these days, several systems for the same space as a single, larger system.
Also consider virtualizing. Since you run CentOS (a rebuild of my employer's Red Hat Enterprise Linux, of which we release all source code), consider Xen paravirtualization. Xen paravirtualization has so little overhead. And once you virtualize the instance, you can move it to new hardware without issue.
This is what I've done on Wall Street (15,000 servers) as well as at my current, large Federal client outside of DC (with peta-bytes of data).
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