Simple answer is the low volume SRT6 roadsters, followed by SRT coupes. These are mostly 2005s and a few 2006s. With 50% more hp than the other Crossfires these are keepers.

Limited roadsters of any year, mileage and condition being important, bottom of the line models would be the base models and the so called Special Edition roadsters which are essentially stripped Limited roadster models with a bit of bling.