if im right in saying the more cores you have the faster you render, so go for the AMD FX 8150, or i5 2500K.

Rati wrote if im right in saying the more cores you have the faster you render

Okay, this is right.

Rati wrote so go for the AMD FX 8150, or i5 2500K.

NO. The FX-series is sh*t, we need to make a copypasta for this... An Intel i3 2100 will outperform ANY AMD chip regardless. The most ideal processors for video rendering are the Intel i7 series processors. The cheapest being the 2600k, a major consumer favorite. I wouldn't get an Ivy Bridge series unless you don't plan on overclocking. An i5 will get the job done, but it only has 4 cores/4 threads so it won't be nearly as fast as an i7 with its 4 cores/8 threads.

You might want to get faster RAM for rendering, I'm unsure if it'll have a faster effect on videos, but for stuff like Open GL rendering, it's the difference between 2 hours and 7 hours.