An obvious choice that seems to be overlooked would be the VQ25 v6 with a turbo. In fact if I were Nissan I might even drop it down to 2.4L to capitalize on the original 240z name. They could easily make 350hp, keep it a v6 with lighter weight, less NVH and it would sell.
The other option that I think is likely is to go back to 3.5L without VVEL but add in DI, that would probably get the same power or more then the 3.7L with better gas mileage, cheaper price, lower weight, etc. Lose some weight and you have a winner.
Third option, given the rumors about platform sharing with Mercedes, perhaps the next Z will get the new 2.0 turbo 4 from the new AMG with 350hp/335tq. If the Z were to lose a couple hundred pounds of weight that would a beastly car.
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