[silverc4s]

GH,
Not sure where in the world you are, but here in the good old US of A the market is pretty soft.
There has been a top-down-driven flood of used late model P Cars entering the old mercado, starting in 2000 with the Dot Bomb, and just accelerating from there as events got progressively worse.
If things keep going as they are, we wil all be selling our toys to the new-vo riche Chinese factory owners, as they flood our shores for weekend buying jaunts in a few years.... rant switch OFF!

Keith Martin's latest Auction Price Guide for collectible cars lists a 87-89 Carreara targa as selling between $22,500 and $25,000. This may be a bit optimistic as there are 964s crowding this space, and 87-89 cars selling in the teens everyday now. Your low mileage example, with cool color combo may be just the ticket for someone, and in that case you could get this kind of offer. Best plan may be to hang on for a few years, wait out the bad market if you can..
Not much hope for salesabove this range I fear... Good Luck