Honestly i would save my money for a better tuner! I have owned the Diablo Predator and it really sucked, my car felt slower afterwords so i used it just to adjust my gears only. The predator had less features than the Sct tuner and most tuners that are really good use sct over diablo anyways. There was a few local diablo dealers but no one new if they were good or not, so i drove far to a good shop and got my sct. It has so many features of diablo. I posted on there forum so many times about getting help, or asking for a 87 octane tune or even a tune to support higher injectors. They didnt care and wouldn't help. I actually got SCT to send me a tuner to work with my injectors so i could drive to the shop safely. Even with a custom tune i was able to make adjustments and so on. The predator also can only hold 1 tune. Honestly i would have probably gone sniper but no one near me knew what that was when i was looking for a tune. There a new company and have been doing well, As time goes on and i sell my sct ill be buying one from them since you can do all the custom tuning from the pc. Do it right the first time. I'm actually going back for a new custom tune since i just rebuilt my engine.
Go SCT or Sniper. I would do sniper because they have lots of things you can adjust to the tuner over sct. Plus there willing to help you with a custom tune.