I currently own an '03 6.0 PSD and bought it new. It's on it's second set of injectors, 4th turbo, second fuel pump, and 4th EGR valve. That being said, I love the Ford body and interior. We've never had a problem there, very solid.
Now that I own a Cummins I wish I'd done my homework back in '03 when I bought my first diesel because I'd own an '03 Cummins instead of an '06 ( which I love!).
I know the 7.3 was a solid engine but after all of the issues with the 6.0 Ford lost a few customers.