Go with Tailor Made Decals. They are absolutely the very best. Most of the Jet World Masters use them. Also, they are a fantastic company to work with, have quick turn around times and they guarantee their work. Don't forget that they offer paint too.
http://www.tailormadedecals.com/index.php?language=en
I haven't had any luck with Promark. IMO, they have horrible customer service.