For the CPU you will be wanting something with more cores.
The Intel Core
i7-980X Extreme Edition Gulftown 3.33GHz 6 x 256KB L2 Cache 12MB L3 Cache LGA 1366 130W Six-Core Desktop Processor BX80613I7980X is what you're looking for.
The new ATI 6990 with dual processers and 4GB's of memory on each card, (when it come out in about a month), or the
NVIDIA's GeForce GTX 580: depending on which motherboard you decide on.
You'll probably also want a work station board. Something like the
ASUS P6T7 WS Supercomputer 3Way SLI + PhysX at Real X16 X58 CEB Intel Motherboard or the
ASUS P6T6 WS Revolution with NF200 3xPCIe true x16 LGA 1366 Intel X58 ATX Intel Motherboard. Both boards are capable of 24 GB's of memory since you're processes sound memory intensive. They don't have the S-ATA 6GB's or the USB 3 but unless you're running SSD's you won't miss them.