The test I've always wanted to try that I think would really fly is to get a QUAD Xeon server. With HT on this would almost like running 8 CPU's. We run servers that way and they fly.
Seems Vegas 6 could really scream with that and 8-16 gb of ram.
Then stick some fiber attached storage to SANS and yippee!
Of course were talking the same price as a luxury car.