there are a "few" cars who's RETAIL price used has surpassed there original selling prices when they were discontinued...

'99 - '00 Civic SI
Integra Type-R
BMW M Coupe (Z3) with the newer 333 HP Engine
Scion tC (retail higher used then they do new, don't ask me why...)

I'm sure I can rack my brain and think of one or two more...

I think the Crossfire(SRT-6, specifically) are a likely candidate, especially the Roadsters.

The BMW M Z Coupe is probably the most comparable car and situation. Low Volume, relatively unknown, Not marketed at all...