Most people on here will only be able to give you 2nd hand opinions.
Speak to Paul (NSX2000) - he's already got his, and will be able to give you a comparison vs his NA2.
My 2p (based on 2nd hand info and guesswork!) - it'll depreciate a lot quicker than your McLaren, will probably feel less 'sporty', but the hybrid system will give it a fairly different handling style (esp. the torque-vectoring), and the instant torque will make it feel as quick. From a brief sit in it last year, the driving position will feel very familiar to any NA1/2 owners...and it looks better in the flesh than the photos.
"No man with a good car needs to be justified"
Blue '08 FD2 CTR - big, ITR-sized shoes to fill...
Yellow '96 NSX 3.0 - oh was it worth the wait!
Black '99 ITR - well, I had to have another one, the first was so much fun. Miss this one even more than #1...
Blue '03 S2000 - SOLD, flawed but fun
Blue '04 Focus TDCi Sport - SOLD, very good fun for a diesel!
Black '00 ITR - SOLD, still missed
Red '98 Civic VTi - SOLD, probably still bombproof