Thanks for the info Dimitris, helpful - but I'm going to jump in and ask pretty much as the same question. I am looking to buy either a dual xeon workstation or the highest end i7 (or wait till the new ones come out this summer).
My workstation will primarily be a 3DS Max workstation using Vray to render. I will use a GTX 770, that will work for me. So the most important thing for me is to be blowing out renders. At work I am spoiled with a nice BOXX i7 980 OC'd to 4.1 Ghz. That gets about 900-something on cinebench. We also have server xeon slaves nodes, some are10 core E5's, so I'm used to having lots of buckets.
I'm looking for something to use at home for my own personal projects, and some community development animations I plan to do. My budget is about 6kish USD. I guess my question is, for rendering - how crazy would I have to go with xeons to make them worth it (i know, subjective) over the fastest i7?
EDIT-
http://www.cpubenchmark.net/overclocked_cpus.html
A 6K system w/ dual 2687W's @ 3.1ghz might be good...?