Keep Looking. I had a 6.7 about a year ago. I only had 32K miles on it. It went through a complete engine replacement. I mean complete $18K complete. Every month after that, I went through 4 turbos, 2 DPF filters, and 3 complete EGR system. I really loved the truck but after all the troubles I had, I got rid of it and bought a 2011 Duramax. Best choice I ever made. If your thinking of a 6.7L Dodge, then you need to visit.
http://www.cumminsforum.com/ There are tons of guys having the same problems. They all got solved when they tore out the EGR Crap. If you do that, then you will not pass smog. If they do not smog in your state, then you have nothing to worry about.