If you wanted to save some money, installing a new SSD and more RAM would save you a couple thousand dollars. The new SSD would speed up your "on the side" video projects. If not, then get what you can now for longevity. If it's the 13, it will still be an amazing machine.
LOL!!! The RAM is soldered to the logic board, so that's definitely not upgradable. Upgrading the SSD wouldn't speed things up, since the 2015 MBA already shipped with an SSD. It would only provide more space.
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Don't forget you can get student discount at the Apple Store and just have your student ID card with you. With the discounted price, you may consider using that saving towards upgrading your memory, RAM or processor. You may check to see if the school store at your college sell Apple products which may be discounted.
I highly recommend checking out authorized Apple resellers. Apple's student pricing is an insult to many students out there compared with non-student pricing offered by many Apple resellers. If you can wait a bit, you'll find some great offers on Black Friday later this year. I bought my maxed out 2016 MBP at ~50% off from Expercom, an authorized Apple reseller.