So what are your goals w/ this car?

As someone stated previously, your best bang for your buck is to pick up an RX-7 and use the extra money for mods seeing as how a stock TII can keep up w/ an S2000 or RX8 in a straight line (and in the corners after a few mods) and and FD would murder both of them. But its your money...

That being said, I've driven an S2000 C/R (best s2k out there) and it was hella nice, it was nimble and responsive (it actually felt similar to my FC w/ suspension upgrades) it sounded nice (not rotary nice but damn good). It comes w/ a hard top (score!) and the seats are sick!
Only drawbacks I saw were that its very small inside...especially w/ the hardtop on, they didnt' bump up the straight line performance, ohhhh, and its 40k!!!

Both cars have their drawbacks:
RX8: hard to make power w/o $$$, requires attentive knowledgable owner, Heavier
S2K: hard to make power w/o $$$, notoriously weak rear end, off throtle snap oversteer (so Iv'e been told...)

Drive them both and see which you like better there's plenty to make you laugh and cry about both.