I would reccomend Dan Cragin, at DC Performance in LA. Solid character.
John Horton of West Coast Vipers is great too, and closer, just over Ortega Hwy in Temecula. Fun drive.
The local dealer keeps changing viper techs, and that gives me no confidence. Last guy I saw there was like, almost reading the manual while he worked, and said he didn't even like Vipers. That was the last time I went there!