I've been in the same boat as you for a couple of years. My 7.3 was awesome and went to a gasser 6 years back. I've had the itch for a diesel again and in my price range, the 6 was it.
Edit** My buddy talked me out of my 150 and I'll be picking up an 04 6.0 in a few days. Getting it at a pretty good price and it's already been bullet proofed so I guess time will tell.