I'd go the 6.7. Buy the 5.9 now and it's going to be "old school" in six months.

 

I went 5.9. But, I like "old school." I replaced my 96 with 215,000 with an 06 5.9. Its proven, its works, and its been around forever. Hopefully, I'll someday replace my old 06 with 250,000 miles for a 2016 6.7 after it has shown 10 years of trouble-free service (which I am sure it will). Im not good at being a test market.