i would buy a fx6300 just for fun and to have a nice toy, but ryzen cpus are almost here, that will change prices alot
the leaks seems to point half prices of intel and same performance, that means massive changes on prices and performance in both sides, no, a fx now, is a very bad idea
only viable under one circumstance, used and very cheap combo or cpu, ram and mainboard, something like 100 dollars for all 3 with 2x4gbs of ram, other than that, no, don't buy that old fx
if the budget doesn't allow for a i5 or you can't wait, the i3, is in general ideal for what you want