I came to like Boxleitner a lot from his work on B5. But personally I've always seen and heard Burt Reynold's as Vaughn.
Think of Burt Reynold's from Cannonball Run
and Cannonball Run II
and you'll soon see it's not a good fit (IMHO).
Have a look at this image of Boxleitner and you'll see he fits as Vaughn very well.
^ You may as well say 'take a look at Boxleitner in those Gambler movies he did with Kenny Rogers' and say he's not suitable. There's more to Burt than his good ol' boy persona from the likes of Cannonball Run.
I agree with you Captain, but at the same time I can understand where Jwolf is coming from. There are some actors who get stuck in your mind in a certain way and nothing else they do will ever erase that image.