1981 Ferrari 308 GTS, 56k miles, $35,995 vs. 2005 Maserati Coupe GT, 32k miles, $34,999 vs. 1976 Porsche 912 E, 99k miles, $39k
If the Porsche was a 911, I'd take that. Since it's a 912, I'll take the 308, one of the best-looking boxy Ferraris. It's kinda slow, even in its day, but the noise around you during hard accelerations is so pleasantly rousing. You said these are all in good condition, so I expect it will take longer time for it to break down compared to a 308 costing less than US$30,000. As for the Maserati, well...it doesn't look evocatively exciting, and not a particularly outstanding grand tourer in its time. I expect more from a Maserati made in the twenty-first century.
1993 Infinti J30/Nissan Leopard J Ferie (Y32) vs. 1993 Lexus GS300/Toyota Aristo (S140)
In white, the exterior styling of these two is just as interesting as that of a refrigerator. I'll take the Infiniti J30 because there's a certain kind of weirdness to it, particularly on how the taillights are shaped and positioned.