Definitely talk and possibly meet with all the tuners and customers of the appropriate tuners mentioned and go with the one you feel most comfortable with.
With that being said and keeping in mind my personal bias is towards Heffner Performance for too many reasons to list, you really will not regret choosing Jason Heffner in any aspect. Extremely knowledgable, honest and hard working individual with the quality and dedication second to no one! To my knowledge, Heffner Performance is the only tuner who is using the AEM EMS for engine management on Gen III Vipers. With any type of forced induction setup, the AEM EMS allows for the absolute best tuning available to date, which is worth its weight in gold.
I can assure you, choosing Heffner Performance for your modification needs will be one of, if not, the best choice you can make.