Intel i5-4670K or amd fx-8350

Well performance wise Intel is way faster but it does cost more money it would have to depend on if you are willing to spend the money.

I have done 3 builds with the Sabertooth , very nice board , one of the best for overclocking the 8350.

Cooling with the Phanteks PH-TC14PE.

My latest build is with the ASUS Hero and the 4670k.

Get the i5-4670K.

It's faster in 95% of the games on the market by up to 40% though the average is likely closer to 20% depending on the game.

The AMD CPU's also often have a lower "LOW FPS" in games which statistically results in more stutter.

If you hadn't been spending $500 on a GTX780 I likely would have said get the FX-8350 to avoid buying a new motherboard but you can find a good Asus Z87 for about $130 USD and probably sell your current motherboard so the price difference isn't too extreme.

*Example of lower AMD performance:
Skyrim:
http://www.tomshardware.com/reviews/fx-8350-vishera-review,3328-14.html

Other:
http://www.anandtech.com/show/6396/the-vishera-review-amd-fx8350-fx8320-fx6300-and-fx4300-tested/5

(Use the i5-3570K as it's similar to the i5-4670K. The benchmarks in the link immediately above are lower resolution, however I've seen the 1920x1080 benchmarks somewhere and they're all worse on the FX-8350).

Also, keep in mind the BETTER the graphics card, the BETTER the CPU needs to be to prevent bottlenecks.

Update: Here's a nice $130 USD motherboard for 1150 socket->
http://pcpartpicker.com/part/asus-motherboard-z87a

Editing performance of FX-8350:
http://www.tomshardware.com/reviews/fx-8350-vishera-review,3328-9.html

"A higher base clock rate does help the Piledriver-based FX-8350 land in front of the almost two-year-old Phenom II X6 1100T, but it trails the full complement of chips from Intel."

It doesn't appear to me that the FX-8350 is necessarily even winning on average for editing either. It does in some, but not all so it depends on what you use but it's not necessarily ahead.

The FX-8350 also dumps up to 100Watts more heat energy into the room which is pretty significant if room temperature is an issue.

First of all, the two chips go blow for blow with one another. Yes very intensive single core game like skyrim the intel will win, but for everything else especially newer the amd wins about half and the intel wins the other half. Whether winning or loosing your talking a few fps.

As far as spending $500 on graphics, a side grade to an i5 wont have any benefit over the amd for gaming. Yet since he's looking for more performance in rendering, so the amd will win hands down in that area. The only benefit the intel will have in rendering is if you were to get an i7 with hyperthreading.

And as for getting an i5 so you wont bottleneck your 780, theres just no possible way a 8350 would even bottleneck your 780. And if your talking maybe years down the road, well theres a lot who believe games will begin utilizing more cores than 2-4 and start going 6-8 (especially since consoles are now 8 cores). And if that is ever the case, then the 8350 would go from being a few fps higher or lower, to several and I mean several fps higher, like well over 10-20.

If you want gaming then yes intel wins, not by much, but pure gaming it is better all around. But since your editing and rendering, having the extra 4 cores (albeit not as strong ill admit) will definitely help you out a lot more. And if you were to go intel route, then save up and get a 4770k. But don't get an i5 if your rendering. But if you can get an i7 4770k, you wont regret it. But even then, an overclocked 8350 goes blow for blow against the i7, yet yes the i7 wins more. But gaming 8350 vs i5 blow for blow really close with intel edging. Rendering it'd be i7 vs 8350 with i7 winning more often. But rendering with i5 vs 8350, its just 8350 wins hands down by a large margin.

My setup is 8350 with gtx 770 and I get ultra setting on every new game with 60+ fps and is only limited by graphics card. Plus I plan on getting the titan black at $1000 just for workstation and gaming card, and do still plan on keeping my 8350. I love it, but yes when it dies I will go i7 route, but 6 core route (which is $550 chip $200-300 board)

you absolutely made the right choice. look at my post above and notice how much higher the pure integer match and physics based operation scores, the AMD destroys the Intel. 3D renders etc have a lot of computations to work through, and they can be performed in parallel, so those extra cores WILL make the difference. And my post is of my FX 8320 @ 4.0ghz (the green bar ); so the 8350 will be even better!