Ok, let me give you some solid advice - stop planning! Don't buy things because you think you will need them. Buy ONLY when you need them. I bought a printed because who would go to uni without a printer - thinking about all the printing you will be doing! Turns out, 90% is electronic now and the remains 10% needs to be printed and bonded in a special way so you go to the uni library to do it. Not only did I waste my money on a bloody printer - but I had to lug it around for a few years and stubbed my toe on it at least once a month.
When you do need to buy something, buy the cheapest one that will the do the job, and try and get one that doesn't' take up space. All the little things add up - especially when it comes to moving around. Instead of getting an office staples - get the mini stapler - does the same job and is smaller and cheaper.
As for a laptop - this would be the only thing I would advice spending money on. Consider it an investment. Get one that will last you 4 years minimum - get yours external hard drives for backing up your laptop and maybe get insurance on it to. Your whole degree will be on this.
Everything else you should be ready to trash at any given time and not shed a tear over.