[twin plugged targa]

Without the salvage title I would have said $30-35K but with the title I would have to compare it to a number of 993's which have been appearing recently. They have been cars with a salvage title in the $25K range which might normally be in the $30-$35K.
With this in mind I would say your car may be worth $25K ish (depending on service records).

I think you can draw a comparison between 930 and 993's because most of the shoppers who are buying old cars are buying them as weekend fun cars!.

This is just my opinion (based on the fact that I am in the market for either a nice 930 or 993!)

Rgds Ben