anyone have any suggestions on workstations to speed up rendering time. right now, i am rendering on my personal computer and as you know, everything else bogs down while rendering. what's a good system that i can render on to keep my computer freed up to do other things. i'm looking to spend up to $3,000.00 US, but would love to find something for less. also- if i did it this way, do i need multiple liscences for rhino and vray?