Video production

Well hmmmmmm if you would like to elaborate on what you are asking.

Budget
Program that you will be using
Any other uses for the setup

Without any real info from you I will just say get an I7 980X@$1000 since you list no budget or any sort of substance to your question.

Also we don't know whether your talking about a cpu or gpu.

I do professional video editing work myself, so I'm going to give you a suggestion. for professional video editing work, you should really be on at least a Nvidia Quadro CX or a AMD FirePro V7800 with any of the current 6-core cpu's. (1055T/1090T/980X) <-- in order of performance

why not quad Xeon X7560, $4k/cpu

At the other end of the scale I still edit HD video (HDV or DNxHD) on my Pentium-4 with a 7800GS card; it's far from ideal, but perfectly usable so long as you don't expect many realtime transition effects.

My vote would go for an i7 and a decent video card with plenty of RAM and lots and and lots of disk space.

the software matters too, like adobe premiere cs4 rendering tool is ridicilous because it doesnt detect all your processors and uses just 1 even you have a x 10 quad.

however on budget I recommend an i7 920 because of tripple channels but you must have a ddr3 ram in there of 8gb

if you are filthy rich, get xeon