Hi,
With old bimmers, sometimes you can find a nice clean old car that happens to be automatic, and do (or pay for) an auto-to-manual tranny conversion, and then the car sells a lot easier when you go to resell it.
Does this work with Porsches? I have a nice 993 I am looking at, that is about 2-3k under market, I suspect because it is an automatic. I am tempted to buy it, and do the conversion. Another possibility is to just live with it-- I think you can also shift manually by using buttons on the steering while if you want to. But I suspect that in the Porsche world, doing a conversion would reduce the "originality" of the car and be a detriment, not a plus, to price, let alone the cost of a G50 tranny (not sure how bad that is, afraid to ask) and the price of the labor.