The R1200 (OC'd to 3.9 GHz) matches the i5-7400 in most games, which is a semi-nice place to be on an extreme budget. I'd certainly never advise actually paying a tad more for any FX processor...
Next tier up is R5-1400, and, if at all possible (fiscally), the R5-1600 is a VERY nice place to be at that pricing point!