Buy an AirStash+!
I have a 64 GB 4G (AT&T), but since I got the unlimited storage on the AirStash! I never come close to filling it up! I have several 32 GB SD cards filled with pictures, a few 16 & 32 GB cards with Pages, Keynote, Numbers, & PDF documents! I have 4 32GB SD cards with movies for those long plane rides!
It gives you the unlimited storage READ & WRITE that Apple says is impossible!