Welcome to the Becker forum and Bladeforums, Java, glad you stopped in.
The Gen 1 BK2 doesn't have an extened pommel, but does have a solid handle area. The Gen 2 has the skeletonized handle, and a pommel exension.
My preference is the Gen 2 for bushwork. It give you the ability to point drive the knife, thus giving you more functions in the same package. I also thin the balance on the Gen 2 is much better and will afford you less hand fatique when you are using it for extended periods of time.
Plus, the Gen 1's are getting scarce now, and are only gonna be found on the secondary market, or in a shop where product doesn't turn over very much. The Gen 2's have been out for a few years now, and are pretty much the standard you are gonna find.
As for leather, we have several makers here, and I don't envy you having to choose, the all do fantastic work and are great guys.
Good luck, let us know what you wind up with, and once again, welcome.
Stick around, and hangout, its a good community to be apart of.
Moose