Look at this one
http://cpuboss.com/cpus/Intel-Core-i7-4770K-vs-AMD-FX-9370 although cpuboss isn't usually where I go to look at performance benches.
The i7 will have superior single core performance, and once you overclock it it will be even better. Cosnidering the 9370 runs at 4.4 Ghz at stock it will produce a LOT of heat so I'm not sure you will get much more juice out of it. If I were you I'd go for the 4770k, since you're getting 780 sli's and all this needs to be a truly top spec rig.
The intel's have much better per core performance than AMD as demonstrated by single-threaded apps and games. You probably wouldn't see much difference when 3d modelling anyway but the 4770k outperforms most chips out there. Not to mention that the 4770k has 8 threads anyway so it will have equal or better performance than the FX.
Personally, I don't like sites like CPUBoss. They use lots of synthetic tests that I just don't like, but each to their own.
All in all, since you're getting 2 780 ti's you need to go really high end, I'd say the 4770k. It will run cooler at a lower clock speed and you always have the potential to overclock. One of the best chips out there. I'm not saying that the 9370 is bad (it is very good), just from my own experience I'd say the i7 would be better just for that per core performance if nothing else, even though the apps you're using will be multi-threaded. I guess it's up to you - both will game extremely well (especially with those GPUs) and work very well in multi-threaded apps. I just think the i7 has the edge (temps, lower clock speed, and better per core performance). Reiterated myself a lot there lol.