1) No idea
2) Do a search. People have posted their benchmark numbers. Also, it won't be 27% off as you can't add them together. You have to multiply them. It will be 25.2% off.
3) It's a crap shoot. They have a 21 day return...
M70 is much more mobile than the 9300. Both are similar in performance in games, the M70 does much better in 3d work. BTW, I sent back my M70 so it might appear in the outlet soon.
I have mine as well. Same samsung as the pictutres posted before. The screen looks a lot better now and the whites are better as well. Light leakage is better for me too. All in all a much better screen. I'll be keeping it now...