Welcome GTS,
Best wishes for a successful search.
Because they only imported around 2,008 968 cabriolets & somewhere around the same amount of coupes to North America, the selection pool has fewer potentials choices. Combine that with attrition over the last approx. 25 years, so my suggestion is don't be too picky

. Many more possibilities for 914s and BWMs due to the much much higher production #s (Porsche produced something like 10 times as many 914s as 968s)...
(BTW, also a 914 fan and formerly had a 323i...which had M5 wheels and just a car I would like back in the fleet)