Seems a wee bit high though a quick look around Auto Trader shows prices on Roadsters from 28K to 15,9K so it's not outrageous by any means.

The $400 warranty fee is correct because you're the 2nd owner.

Paint chips on the front end - nothing new there (my '04 w/ 69K on the odometer is starting to look pretty gamey in that dept.!). Check under the doors for any rust.

Given that, I'd say "sign ze papers!"