Not including the Enzo or Carrera GT and other exotics. Post original MSRP and link to car for sale.
C5 Z06 was $52k new - retaining >50% of new 10 year later is not too shabby...
Let's keep it to 2004 model year cars only.
Inspired by Jagvar's Maybach post.
Also, old, but good article from C&D: