i would think the new 6.7 cummins are not going to hold their resale value that well. all the epa stuff, and the regen problems are going to hurt it. if was going diesel i would wait for the new cumins with the urea additive.
try and wait till the 13s come out, i believe i read they will be using the urea additive. if you see a lot of short trips in your future, do yourself a favor and get the hemi.