I don't have LE, but I do have Premiere and some other software titles, yet I still mainly use Studio 9. What is it that 9 isn't doing for you?
There are titles that JUST do DVD's, chapters, etc. and I've used some, but I usually find it easiest just to stick with 9 and so far, it's done everything I've needed, even some things it wasn't supposed to be able to do.