Are you really sure you want to invest money in this platform? Honestly, since this platform is basically dead now, it's been end of life with no new products and nobody manufacturing neither CPUs nor motherboards for the AM3+ platform for over a year now, so any motherboard still out there worth using, that's new, is seriously expensive. Cheapest price I could find on the motherboard you have right now is about 250 bucks new.
Are you looking to go with a new board or a used one? Because for 250 bucks, which is just about what the asking prices start at on ANY decent 990FX or 970 chipset AM3+ motherboard are starting at for new old stock, it's hard to justify.
I'd REALLY recommend putting that money towards a newer platform that will destroy the performance of what you could possibly get from that setup, even with a big fat overclock on it. It wouldn't be all THAT much more to go with a new CPU, board and memory than just buying that motherboard. Well, it would be more, but it would at least be money better spent. I'm more than happy to help you find a good board, but it won't be cheap unless you go with a used board and then of course, even if you buy from a pretty trustworthy ebay seller, you are still taking somewhat of a risk that nothing is wrong with the board.
Since these FX systems tended to run so hot, that's a pretty big risk in my opinion. Surely there ARE some perfectly fine used 990FX boards out there, and one of those WOULD be a lot cheaper and then potentially make it worth the investment, but you still end up with a five year old platform that can't even be a lowly i3 from this generation.
I'd be inclined to recommend something like this, rather than going with that. For less than a hundred bucks more than it would cost just to get a good motherboard, if you buy one new, for the system you have now, you could upgrade to this with an overclockable Ryzen 5 1500x that has 4 cores/8 threads, 8GB of DDR4-2666 memory and a fairly decent Gigabyte Gaming board that has shown itself to be very stable and capable of decent overclocking with Ryzen CPUs. It's worth considering. Plus, it gives you a platform you can upgrade later to an even better CPU later down the road if you wish. With what you have now, that's it. There is nowhere to go from what you have. And I'd say that conservatively this Ryzen configuration probably offers you at least 25% better performance than that FX-8350 at stock settings with no overclock.
PCPartPicker part list /
Price breakdown by merchant
CPU: AMD - Ryzen 5 1500X 3.5GHz Quad-Core Processor ($164.00 @ Amazon)
Motherboard: Gigabyte - GA-AB350-GAMING 3 ATX AM4 Motherboard ($84.99 @ Amazon)
Memory: Patriot - Viper Elite 8GB (2 x 4GB) DDR4-2666 Memory ($94.99 @ Newegg)
Total: $343.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-11-30 04:07 EST-0500
If however you still wish to go with a new motherboard, about the only one I can find that is truly a very good quality board, much better than that 970 chipset board you have now, that isn't over three hundred bucks, would be this:
https://www.outletpc.com/de7484-asus-m5a99x-evo-r20-amd-990fx-amd-motherboard.html
And honestly I just don't think it's money well spent. Also, there a lot of things you get with a new platform besides just the improvement in CPU performance. You get MUCH faster DDR4 memory, you get PCIe 3.0 x16 graphics support instead of PCIe 2.0 support on the 990fx boards, you get super fast M.2 NVME SSD drive support, plus USB 3.1, much better audio and probably a few other features I can't think of off the top of my head right now.