Hey folks.  I've got a 2013 Mac Pro 6,1 Quad 3.7 GHz master computer, and I'm finding it to not be quite up to the task these days so I'm going to upgrade the CPU.  

I mostly do hybrid orchestral film scoring, so i've got a massive amount of VIs, mostly Kontakt inside of VE Pro on a slave PC with some Kontakt and miscellaneous other synths (Omnisphere/Trillian, Zebra, etc.) on the Mac.  I do lots of stems, so I'm using multiple reverbs and a fair amount of processing while tracking.

What's the current thinking these days when looking at a new CPU, is it better to go for a 12-core 2.2 GHz E5-2692 v2, or something like an 8-core 3.3 GHz E5-2667 v2 QF67?  I've found them for comparable prices, so it really comes down to the more cores/faster clock speed argument.  Any suggestions?

Thanks.