All right, another one sees the light.
I have a 550 with the powerstroke and like it. Be prepared though, there's a whole new world of mods and stuff for the powerstroke. I just got a 2000 F150 to tear around town in, too. (My good friend is a ford parts guy, so I'd be dumb to get anything else)
The 7.3 is tried and true, the 6.0 is fast and new.
check out this website- http://forums.thedieselstop.com/ubbthreads...hreads.php?Cat=
Too bad you dont live by me, Im a dealer, (could take you to the auction)
Let me know if you need ANY parts OEM or aftermarket.