I had my heart set on a s2000 for years (came out in 2000).
Friend of mine/Jaguar dealer manager brought a used one home for me to try back in 2003. My wife and I loved it.
Fast forward 4 years. I drove a 2007 in December this year, when I was trying out roadsters. We did not like it so much (and it was the first roadster we drove). They are loud, VERY low on torque, and have to rev up to the redline to produce their power.
Small cockpit too. The Xfire has a lot more room - IMO.

They are VERY reliable though, have lots of aftermarket goodies available, they have quite a club-type following, etc.

From what I read, Honda is going to come out with more of a grand touring style roadster next as the s2000 replacement.

I can't knock the s2000; it is a fine auto. I would recommend you drive one and see what you think.

Good luck.