I would opt for the the 3000lbs version but I think that 350 FWHP is not enough to compete with that weight. The car should be able to compete with upcoming M3 and M5 easily, not even mentioning cars like the Modena 360
The 350 HP you mention is already easily achieved with the current engine with no too difficult to apply mods. A new NSX should have around 3.3-3.4 Kg/HP (7.2-7.5 Lbs/Kg).
We all know Honda can do this. Now it's up to them to show the rest of the world.