best bang for the buck is the psd 7.3 if you ask me there cheaper than the cummins but solid as hell
I would have to agree with this. If you wanted a dedicated tow rig get a decent 01-up dually 2wd 7.3l. There's a ton of them so they can be had at a good price if the time is right.
A 12v Cummins is a superior engine, but everyone wants an arm and a leg for an older Cummins. Plus the trucks they came in are absolutely hunks of crap. Bad transmissions, cracking dashes and shit.