Thanks. This is the kind of help this site is for. From all the responses I think I will go for the Nelson Tune for now. This is for a family vehicle, but who says a family vehicle can't be fast. I only use the performance when I am by myself.
2002 Suburban 5.3L, K&N Intake, Gran. MAF, Powerstat, Baer AlumaSport Brakes, Russell Stainless Brake lines, Mild Belltech Lowering, Belltech front lowering shackles, 20's Goodyear GTII's, 4.10 gears, Servo, TB Spacer, Hypertech Tuning, Corsa Cat-Back Exhaust system