I would get the cayman. old stock 986/996/987/997's are a dime o' dozen.
You should have no problem selling the Cayman. although unless you downshift to a BGB 981 Boxster with a 3.8L, anything else could ruin you for good.
In my estimation the only thing that can beat a Cayman with a big motor is a Boxster with the same. Overbeek proved this on that karting track doing a head to head Boxster Spyder vs. Cayman R.
Boxster Spyder faster on every lap and easier to drive to boot.
p.s.
Getting out before the warranty is smart. Just spent $4K on a job that conceivable could have been done two years when I last did major work.
That bill was already $5K. Which means had I checked all the boxes we'd be talking nearly $10K. But hey my car is running like new right now
and no monthly bill.