For that much? Get a Quadro 6000. Also make sure you get your hard drives in raid. Don't know much about workstation builds, but I do know a bit. And you can't put that much memory on that mobo. Double check everything to make sure it's compatible.
Wait - a Quaddro 6000?? Why not get the new K5000? It's Keppler based, handles multiple monitors with relative ease, and uses less power than the 6000 does. RAID leaves a lot more room for failure than a traditional HD setup does.