x79 chipset socket 2011 CPU upgrade options

Hi,

My current PC is based on the x79 chipset socket 2011. I am looking for options to upgrade my CPU. I will be mainly using Premiere Pro and AE working with 4k footage from the Panasonic GH5.

Considering that my motherboard is the ASUS® SABERTOOTH X79, from the list of supported CPU on ASUS' website, my best options are:

Core i7-4960X - 6 Core (3.6Ghz, L3:15M, 6C, HT, 130W, rev.S1)

Intel Xeon E5-2687W v2 - 8 Core (3.4Ghz,150W,L3:20M,8C,HT)

Intel Xeon E5-2690 v2 - 10 Core (3.0Ghz,130W,L3:25M,10C,HT)

Intel Xeon E5-2697 v2 - 12 Core (2.7Ghz,130W,L3:30M,12C,HT)

My question is, from the above, what would be my best option? should I go for the higher core count or clock speed?

I found most of the CPUs listed above for similar price range on ebay. So the price shouldn't really be a factor.

I would appreciate any suggestions. Thanks!

My current setup is:

Processor Intel® Core™i7 Quad Core Processor i7-3820 (3.6GHz) 10MB Cache

Motherboard ASUS® SABERTOOTH X79: SOCKET 2011, R.O.G

Memory (RAM) 32GB KINGSTON HYPER-X GENESIS DUAL-DDR3 1600MHz (4x 8GB)

Graphics Card 8GB NVIDIA GEFORCE GTX 1070

SSD1: Samsung 840 Series Pro 256GB

SSD2: SanDisk SSD PLUS 480GB

SSD3: SanDisk SSD PLUS 1TB

Power Supply CORSAIR 850W PRO SERIES™ HX850-80 PLUS® GOLD MODULAR

Processor Cooling Corsair H80i