I wouldn't bother with the dividers. No doubt you will have 2-3 different lectures a day so just file your notes into a ring binder when you get home at the end of a day.
You will end up paying a premium for a shed load of paper you will undoubtably race through especially when you start filling up one section of the pad before the others.
Just buy the cheapest but best quality you feel comfortable using.
I found 'pukka' pads were quite decent however a little on the pricey side so only ever used them for note taking and never revision.
Out of interest what course are you taking? I was often given handouts for the vast majority of my lectures due to the high content of diagrams/figures required in a science degree and only ended up taking straight notes in a few topics