Depends on your budget. If budget is not a serious constraint, I would look at a configuration like this:
1. Chassis: Supermicro CSe-745tq-r800b
2. Mobo: Supermicro X7DAE
3. Processors: 2 Intel Xeon 5345 quad core CPU’s
4. Memory: Kingston KVR667D8F5K2/2G (2x)
5. Video: PNY Quadro FX1500
6. Raid: Areca ARC-1230 V2 1GB
7. Boot disk: WD Raptor 1500AHFD
8. Storage: 8x Seagate 7200.10 SATA-2 500 GB in Raid5
9. DVD: 2x NEC AD-7173
That gives you some room for the future, albeit at a cost.
Harm Millaard