I am currently working on building myself a pc (my first build of my own), the general purpose will be for gaming. but it will also be used for things such as photo editiing, video editing and 3D rendering.
Now the goal of this build is having a solid build, running everything smooth and possibilities for expanding/upgrading later on (maybe for another GPU)
1. will my stuff fit in the case i chose? (i'm very open minded to changing case if not)
2. i tried to find some low profile ram to make sure they would fit under the cooler. will they fit?
3. suggestions for upgrades or such.
Yes, you can install another GPU later on. But with single GTX780Ti you are already on the top, so i don't think it will be necessary to install another GTX 780Ti.
As far as other upgrades go, i would say that i7 4930k will surely serve your needs for at least 2-3 years or maybe more. I can't be certain what the future holds for upcoming CPUs, GPUs and other hardware.
Hope this helps.