Yeah no problem outputting 4k for applications. Not sure what's better for a laptop though, the 980 or the sli'd 980M's... I would venture a guess that the 980M sli's get better frames, but also worse minimum frames (maybe) and I would also guess that they drain the battery in like 10 seconds flat whereas you might get 15 seconds with the 980. For the games you mention it probably doesn't matter though. The 980 will run cooler and because we're in the realm of space heaters that would probably be the deciding factor for me.
Also 16gb is pretty standard for gaming laptops now. If you want more base that on whatever applications you're using, not which games you're playing.
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