M7 would be awesome..
... and they should make it very awesome by tuning the V12.. it already kicks out 544hp, imagine what M could do with it!?
As for the M3GT, I could live with it I guess, I prefer the front of the 3GT to either the Saloon/Tourer, or the 4 series... but I can already imagine the epic tide of complaining that would wash over the forum.
3/15 to i8, and everything in between (yep, even including the F26 and F45)