I'm 6 foot 2 and my Boxster fits me like a glove. I had to play with the seat a bit to get it just right, but it is do-able.
For the record I've got a 987, I have no experience with the 986, though I don't imagine it to be much different.
Just a warning... If you go to a dealership and sit in a Boxster you just might be leaving the dealership in said Boxster!
Happy driving!
PB