[DeTomaso] NPC: Newer model Saleen, Shelby, Mustang ragtop

[Garth Rodericks]

In a nutshell, you pay a premium for the Shelby name and need to make sure you have some 
money left over to upgrade the suspension (according to the following Top Gear review anyway).

Top Gear comparison of the Shelby with the Roush (jump to the middle of the vid to get to the comparison):
http://www.metacafe.com/watch/339391/mustang_roush_vs_mustang_shelby/