Tuners are like shoes. My perfect fit won't fit you right necessarily. I think we can all agree on this though. Talk to a few different tuners you are considering. Check out their history and customer reviews. Speak with them about your goals and their expectations. Any tuner that tells you he can take your care to the absolute limits safely, just turn around and walk away. A good tuner and enthusiast will know that somewhere between 80-85% is a safe place, or at least as safe as it gets, for a max power tune.
If anyone disagrees with anything I just said please voice it I would love to have a good honest no mud slinging discussion on this. Like I said before Cam will be doing all my tuning while I am in the area. As soon as I find this darn boost leak. Abel you maky be getting a visit.