986's are awesome IMO. I think people who are jealous say they are the poor mans porchse etc no one says to me too poor to buy the gt-r was we as the badge doesnt get the same attention.
I personally think they will hold their value for a few reasons
They are great to drive
One of the best convertibles out there
Its a Porsche they still have that prestige and dont seem to depreciate
Have relatively low running costs, even servicing
With the 3.2s you want it to be manual ( not sure if they did the trip) You DONT need tcs IMO. You want a nice colour of leather they made some gash ones IMO and it covers the dash. You want bose and climate control and heated seats. The ones with the clear headlights look better but you could always perform an amberectomy.
You want nice alloys too like the turbo styles ones ones.
They are great fun to drive and grip like mad. Alot cheaper to run the the 350z too as parts are very cheap. Oil service is easy to do and takes 8-9litres I think.
Leaky roof, rear window made from plastic clouding and starting to tear are your main problems. IMS and RMS are problems too but the serious one destroys the engine and the other one weaps oil.