[FleshChild]

I'll endorse option one and two. It always bothered me that Skill and Guile increase skill slots more than Will does. Either of those options will allow players more flexibility in what they want to mix and match from both of their classes in order to achieve their desired style. This is most evident in classes like Demon Hunter, Spell Thief, and the ( revamped ) Tactician, which have a lot of little things they can pick and choose from.

On another note, this will have to eventually be changed anyways if you're going to add as many classes as you've said you wanted to. ( I don't remember the exact number, but it was pretty expansive. )