The deal hasn't been signed off to Singer yet as he had mentioned but the idea was to have him direct it. Despite this if the off chance appears that he is not available for the job who else would you like to see take up the mantle on this project.
Out of the directors that we have had I would say my top choice would be Bryan singer but I would take James Mangold if he was available. Vaughn was good too but I felt like James brought more of an emotional depth, fresh approach and richer story with his version with plenty of nice comic book superhero elements.
The Wolverine felt like a comic book movie but it also felt like a character driven drama too and had a good blend of action, development and effects that I would like to see cross over to the ensemble films.
I would like to see the film embrace more of the team work side of things and have epic battles and destruction like the film is said to have also the 80s is a great setting aesthetically and in the right hands could provide a great comic book tone in the right hands.