IMHO, you are only about 4-5 hours drive away from some of the best tuners in the country - ECS and Vette Drs. I will be doing some minor power mods to my recently acquired '08 Z (160 thermo, Killerbee intake + Air Charger intake) and taking my car to ECS. I have already talked to Chris at ECS about this and he told me they just got the latest, most state of the art dyno installed. They did a great job on my recently departed supercharged '02 Z. Ran great, passed emissions, and out 608 "civilized" h/p.
My daughter told me she was used to 600+ h/p and would only ride with me if the new car was making at least 535-550 - I raised that girl right!

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'08 Atomic Orange Z06 with 3 LZ Sienna Wrap Interior, Nav, and Chromies. M2W, Halltech Killer Bee, Air Charger, 180 degree thermo, Body Colored Spoiler, More Mods coming