This would depend entirely on what you plan to be doing with it. For most people, 64GB would be more than enough for the purposes that you mentioned.
Personally, I have a 32GB iPad, 32GB iPhone and a 128GB MacBook and none of which have caused me major problems with storage.
If you plan on doing things like downloading large apps, storing many high-res videos, saving large files, or just wanting more space to play around with in general, I'd recommend for you to get the larger configuration.
It is worth considering, however, that some colleges require desktop platforms for some resources, and you might run into trouble on some levels there. Maybe check out Macbooks as well before making your decision.