Building my first pc

Solution
Yeah. i3 6100, and either an ASRock H110 motherboard + 1x 8GB DDR4 (inexpensive) or ASRock H170 motherboard + 2x 4GB DDR4 (more room for expansion later), and whatever video card your budget allows.
Neither. Core i3 6100 + Video card will be far better than either.

The 7850K is a very weak CPU with a fairly good integrated GPU, but the iGPU is still less than half as fast as the R7 260. The FX-8320e is basically two of the CPUs from thje 7850K put together for a total of 8 cores, but most games won't effectively utilize more than 2-3 of those cores, leaving most of them sitting idle. Here's how the i3 stacks up against the FX:

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Here's how it performs against the A10, both using the same GPU:

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