wait for zen and see if it will be backwards compatible with a firmware update for your existing motherboard - they will be a significant performance increase and will likely decrease the price point for existing AMD CPUs. I have an 8150 in my secondary rig - it is running with a 770 doesn't provide the same consistent game experience as my i5-6500 and 950.
Your call, but I wouldn't go for the 8350 or 8370 unless that was the top of your budget
@game junky, Zen is using an entirely different socket (AM4), it's not an FM2/+ AM3/+ situation where there's extra pins & some backwards compatibility. It's a totally new socket.