Hey, welcome, here is my 2 cents:
350z - Pros: Looks fantastic, Sounds great, Drives great, Decent power output and torque and you don't see too many kicking around (unless your scottish )
Cons: ECU cancelling means a pain in the ass to get any more power from the engine unless you go the FI route.
S2000 - Pros: Looks nice enough, Reliable, Reasonably quick
Cons: Small engine and VTec means you need to rev the nuts off to move anywhere, therefore no low end torque.
Audi TT - Pros: Turbo is easily tuned.
Cons: They are very common, quite a boring drive and no one will let you out of a junction again as you drive an audi (except fellow hairdressers).
MX5 - Pros: Cheap and easy to throw around
Cons: Looks like you have borrowed it off your mum
Z4 - Pros: Looks great, engine is rock solid and finish is excellent
Cons: You will always wish it was an MSport and you will loose the ability to be able to indicate effectivly prior to performing any manouver.
Go on you know you want one!
R