If your worried about costs don't buy an exoctic, Lambo or other.

Best information site on the Jalpa, Raymond's site
http://www.jalpa.ch/index_a.html

Cost of parts, when you can find them, is quite high.

Cost of repairs, plan high then double or triple it.

If you can afford it the car is a lot of fun. It won't out run a lot of current production cars out there but then it is +/- 20 years old.

Expect most of the issues you would have with any car that age plus the quirks of any other Italian car.