shouldn't leak at all
if its a version ST, which is the nearest to a UK GT, i'm pretty certain it should have radio buttons on the steering wheel, but i may be wrong. maybe put up some pics of the inside?
ask to check the import docs to see exactly what spec it is (s, t, st. st is highest)and what grade it was when it was imported
imports dont have cruise control
check stonechips for rust, especially along front edge of bonnet
check foglight works, how many keys does it have, does the boot lid open and lift ok