I know I'm predictable, but the DC2 Honda Integra Type R is on my list for the following reasons:
1 - best drivers FWD ever. Race bred double wishbone suspension makes it a sensational drive and hugely effective track tool.
2 - B18CR engine utilises F1 technology of the time into an engine that produced the highest specific output from a NA engine at the time, combined with bullet-proof reliability. Destroyed the myth that high-revving jappers are hand grenades in waiting.
3 - a genuine historical pedigree - produced to commemorate Honda's first F1 win an 1965 in the Grand Prix Mexico.
4 - while not rare, time will make them so as so many are destroyed by idiots and blinged beyond recognition by fools - the automotive equivalent of "pants on the ground, pants on the ground, looking like a fool with your pants on the ground!"
oh, and
5 - I've got one (well 2 actually, but one's not in original trim

) - and it's a low kms minter.
Other picks I'd definitely be happy to have in my garage:
RS4 V8
911 993 - last of the air cooled Porsches
911 930 Turbo (the whale-tail) - raw and nasty