My sister says, find me a Cayman. But what spec to get?
Black?
Seriously though, what is she looking for in a car? They are a very focussed drive and the toss up between manual or PDK would be the first question that I'd be asking. Is your sister in Jersey too? I know that it's reasonably busy in places but you also have some nice country lanes where the manual would be lovely and more interactive from a car.
981 version comes in from 2012 if I recall correctly. The 2010-11 model would be the 987, but still a lovely car - nicer looks (personal thing) but better tech on the later model cars.
There are lots of 'best spec to get' threads, some of them are personal, others done for resale and others are billy basics.
For me you've got the main ones:
Porsche Sports Exhaust
Bose
I would question if you really need heated seats in a Cayman? And in Jersey?
If it was a top-down Boxster, yes, but not in a Cayman. Probably in the 'personal' category.
Sports Chrono would be on my list for the PDK variants, less so on a manual.
FSH - don't discount decent Indy's not necessarily Porsche themselves.
Good luck with the hunt!