The iPad Air is a fine piece of equipment so if you really can't afford another $100, go with the iPad Air 32GB. It'll serve you well and still have a resale value if you decide to upgrade.
As you note, the iPad Air 32 GB and the iPad Air 2 16 Gb are the same price. Having had a 16 Gb for 2 years, I'd never have that little storage again--just too much juggling and uninstalling. For another $100 you could get 64GB in the iPad Air 2.