I think you should change other parts too. Like get the GTX970, and the MB too, don't get the MSI 970A-G46 with fx8 series cpu, here is more info.
http://www.tomshardware.com/forum/330572-30-970a-warning If you are luck you may run the fx8350 on that MB, but I don't how long you can run it without the overheat problem. The gtx970 is better than the gtx780.
Here is list:
[PCPartPicker part list](http://pcpartpicker.com/p/ZYGQwP) / [Price breakdown by merchant](http://pcpartpicker.com/p/ZYGQwP/by_merchant/)
Type|Item|Price
:----|:----|:----
**Motherboard** | [Gigabyte GA-970A-UD3P ATX AM3+ Motherboard](http://pcpartpicker.com/part/gigabyte-motherboard-ga970aud3p) | $74.99 @ Newegg
**Video Card** | [EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card](http://pcpartpicker.com/part/evga-video-card-04gp42974kr) | $349.99 @ Amazon
**Power Supply** | [SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply](http://pcpartpicker.com/part/seasonic-power-supply-m12ii620bronze) | $73.98 @ SuperBiiz
| | **Total**
| Prices include shipping, taxes, and discounts when available | $498.96
| Generated by PCPartPicker 2014-09-26 23:52 EDT-0400 |
And the gtx970 review. http://www.techspot.com/review/885-nvidia-geforce-gtx-970-gtx-980/
Add: do you have the aftermarket cpu cooler? because fx8350 will run very hot, also you may consider the fx8320.