For me, it all comes down to how desperately you need more speed, how much more speed than what can the 8350 provide and how much cash are prepared to give for that speed. Also, whether you are more interested in Vegas or in games.
The FX, despite what otherwise would like the gamers in here, was really never designed for games. It's a workhorse CPU. And it excels exactly in programs that can run well threaded code.
Now, i 've never used rendering, but, i do a lot of video encoding, which is also very well threaded. If it is of any use to you, the 8350 at stock in video encoding, is roughly equal to i7 3770
So, i suspect (but i can't give you warranty on this), that more or less, the same happens in Sony Vegas. So these are the starting points. To get significant advantage in Intel, you have to get something significantly better than i7 3770 (1.8% slower)
Of course, then you have overclocking coming into play, but you should be able to do some rough calculations and see what's best bang for buck for you. With a 8320, overclocking to 4Ghz (8350) is as easy at it gets. So you get i7 3770 performance from the get go.
Here the i7 3770 costs (cheapest price i can find) 245 euros. The 8320 costs 120 euros. For the Intel you will also need a motherboard... From a "business" point of view, in my mind, the 8320 (you may actually want to get the 8320E and overclock it, since they eat less volts), is the best bang for buck. From a purely "max performance" point of view, getting higher i7 models, is obviously better, but they cost a lot...
For games, the Intel should have more longevity.
So, it is a matter of what you prioritize first, how much you want to spend, if you are a "bang for buck" guy or not, etc.Edited by Undervolter - 10/21/14 at 3:57am