There are many vendors on this site that can help you out with a chip module! Most of us would suggest a multi-positioned chip, but alot will depend on your future needs, and what power options you are looking for in the future!
I've tried several now, and all work fine. The main thing is to get the board on your PCM (Power Control Module) clean, which is usually best done with the PCM out of the truck.
As mentioned, there is Tony Wildman, DP-Tuner, Bob Riley at Dieselsite.com, Dave Lott at DI, Dennis at TS Performance, and on and on! Even SWAMP and BEAN'S can help you out with chips.
On this site there is a listing of "vendors" of which most can help you out with a chip, so you might like to check these out as well.
Best of luck..
Dale