I think it's a great idea to do what you're doing!
For the time being, we're sticking with our mine & mine. Although everyone knows that what's his & mine & what's mine is mine :)
He makes WAY more money than I do, so we just try to split things up according to how much we make. Example: he pays the rent & I buy groceries. If we go out for dinner to a nicer restaraunt, he pays, but if it's take out or whatever, then I pay. We buy our own clothing & stuff like that & he occasionally gives me a bit of extra spending money here & there. It works well for us for the time being.