Might want to talk to Keith @ Diesel Dynamics. Have never dealt with him personally, but he seems to have a big following, and posts here on TDR, and gives some good information!
Believe he can handle just about anything associated with diesel. Just beware, bet you find a lot of goodies!!!!!
Or check out May Madness, many venders there, and lots of different options in trucks will be there, so you can get first hand experience and then make an informed choice!