Ah well there you go; you know more than any of us here at MPGH about what you want lol. Well I believe Turbo'ing a 350z is much easier than an S2000, because of space and the amount of trials and errors that have been done to Turbo 350'z.... turbo'ing a car and tuning it ain't easy or cheap ($1000-$3000+) But you a lot of power out of it; I know I can turbo my car right now if I had the money and experience and easily get 50-100HP just from the turbo on a factory engine. Anywho...... S2000 is a cute little thing and has a good power/weight ratio; it's a shame RWD vehicles are rare in Honda. Anyways, which car is more uncommon? I'd get it just to be an individual and when/if anything happens to my car, the community would know who's the owner and tracking it down/getting info on it would be much easier.
Well in my entire life I've seen 2 S2000s on the road including the guy who works with me. There are 67 S2000s on carsales.com.au compared to 239 350Zs.
I think I'll need to do an all out comparison between the two, comparing price of car, price of parts, ideal aftermarket kits, ideal turbo kit, ideal exhaust+headers, and compare how easily the interior can be modified. God dammit it's never an easy choice