Banks is one of the safest, most expensive, and lowest HP set ups out... If you have lots of cash around, go for the banks power pack.
If not, a SCT tuner with any number of the tunes out there, Tadd at ATS, Jody at DP, are just two I like. A set of gauges, pyro, tranny, boost minimum. A 4" turbo back or 4" cat back... And your there, Intake on a 6.0 is optional purchise, the stock system flows great, you can add a AFE filter, or leave it alone.
Banks...3500-4000 powerpack...
What I just listed... at max, everything... 2200... Thats a nice dual system, SCT tuner, Autometer Cobalts, and AFE intake. You will have more horsepower then the Banks, better tranny shifting, and more fun...