I'm not going to get my fingers in the mud of who's PCM is better or worse. Clint @ AIR will dyno tune you, so it doesn't matter if you have an aftermarket or stock PCM, he'll tune your car for what it needs. He's also close to you at I-70 and Kipling. (well....closer than me in Castle Rock)
Shor0814 is on the coloradolsx board as well since he bought an 07 twin turbo vette!!...and sold his turbo GP to his brother... however, coloradolsx just went up in smoke the other day. I'm really hoping it'll come back online soon.
Good luck!
Jesse