Please fill out the form:http://www.tomshardware.com/forum/261222-31-build-advice
so we may assist you. be as specific as possible and if you have any preferred sources, please let us know
generally a 3d workstation will not use CF/SLI and will not be overclocked, through the new SandyBridge CPU's are very stable up to 4GHz.
be really specific on the budget. when you say you want the best a dual CPU i7 990x is $2000 just for the CPU's alone and A Quadro 4000 GPU runs $1750.
do you need monitors included? OS?
Also what 3D software are you using? this will let us know it the GPU has to be beefy (like a Quadro).