Mike... Check this out
I talked to 5 shops in Texas and one in Illinois. Including ART ( I liked them a lot)
But I went with Xtreme HP out of the DFW area. As you can see in my thread we are getting extremely close (over if you take it to other dynos) to 600rwhp with ONLY a Procharger/headers/exhaust. I am out of the shop for less than 10k.
I am not sure if they do turbos, but they will do about any type of supercharger. They have some really high HP Camaros at their shop.
read my thread and shoot Xtreme a PM and see what they can set you up with. I am blown away by their service and knowledge. Shoot me a PM if you want some more info.