Get the SCT X3 or SF3 they look the same just the x3 only holds custom tunes and the SF3 holds Canned tunes AND custom tunes...
Load some custom tunes from either: Innovative Diesel (Eric) Gearhead Automotive (Matt) or Quicktricks (Vivian)
Their reputations are as follows for the most part
Eric: great power, throttle/ power feels kinda like an on/off feeling.
Matt: safest tuner for non-studded trucks, power throughout the whole powerband, Least smokey out of all
Vivian: throttle is kinda in between eric's (on/off) and matts (thoughout) Hers is right in between... Great power, and the Best
cutomer service known to man
Now saying this I will give them all credit... They ALL have AWESOME power, they all are great tuners... and they ALL have safe tunes for "non-studded" trucks (just matt has the praise in that area)
Hope this helps in your decision