Just be aware that the new 2008 you are looking at probably has not had the TSBs done on the clutch and transmission.
The flywheel is a huge issue on the GT500 and only 2009s built after late August 2008 have the new flywheel in them. There are some new 2009s on Ebay right now that were built before the cutoff.
The TSBs are not recalls and the Dealers will not change them out untill they breakdown, and this could be after your warranty has expired.
If you decide to purchase a 2009 open the drivers door and check the built date on the sticker, anything before 09/2008 should be investigated further to verify that the new flywheel is installed. You can also look for vin #s after 95132561.
You may want to review this link:
http://www.teamshelby.com/forums/lof...hp/t35706.html
Good Luck with your GT500 Purchase