Since for usage, you stated "basic school work and web browsing", I'd say get the 2015 one. If you're crazy about the Apple ecosystem and new hardware is like really one of your hobbies, get the 2016 one but do NOT go into debt for a notebook.
Also with the 2015 one, you'll have some budget left for:
- an external harddrive for Time Machine backups
- a solid sleeve
- an insurance against damage/theft outside of the house
- maybe an extra magsafe adapter