I recomend you visit the stickys on or about each supermod you might be interested in. Details, battles, gameplay, etc. Check out the manuals or readme files, let this information be your decision. Asking what mod to use in here is like gas on a campfire.
Or, heck with a fancy new pc you could spend some time with each one and see what you like that way.
There's alot of talent in each of the mega-mods, you could use JSGME and try a few others as well.
