You should try getting warranty quote from AAA, for my 1997 Boxster with 109,889 miles... I was quoted $1048 for 60 months, or till 209,889 miles on the odo.
$0 deductible and the details of what they cover on the vehicle seem very good. They basically cover all the stuff that costs an arm and a leg on the boxster.
Heres the link to my quote:
http://aaautowarranty.com/program.asp?id=187903