Porsches tend not to have much torque so have low first gears with a noticeable jump to second and then nicely spaced ratios for the rest. Used boxes are $$$ but there are lots of gear options available, also not cheap. It's not a hypoid diff so you can flip the ring gear if needed. Standard final drives range from 3.85 (sportomatic), 4.43 (common) to, ulp, 5.29 (!). If you have the $$$ you could build to suit.
In contrast I'm building up a five speed Renault box using parts from a 352, 395 and a 365. I had the 352 pinion shaft modified to 365 spec which will give me a 3.56 diff with 365 gears and a 395 shift arrangement. All in, with three boxes purchased, two given full overhauls (bearings, synchros, seals and gaskets), a torsion diff, and custom machining, I still under the price of a used 901/15 transaxle.