Don't have $100 extra at the moment, and really want the 6. Have tmobile JUMP so not worried about resale, just worried how im going to fit all my music on it. but i'll figure it outIn theory you could, but why? Spend the $100 more, you'll get at least 2/3 of it back in resale.
Sure there's plenty of cloud storage options that'll do fine, Dropbox, box, etc., if you have a computer at home there are apps that will stream from there as well, streamtome for example, I've had every iphone and 3 versions of the iPad and I've never had a storage issue I just don't keep any music or movies on my phone or iPad, and I always buy the cheapest option, I've loved apple for 30 years but I'm not overpaying them for what should be cheap storage. Also, when iCloud photos and drive get totally fleshed out that should help as well. And I disagree on resale, you might get half of your $100 premium back at best.
I was in that same predicament 2-3 years ago. I had a 64GB 4S since I have a lot of music that I wanted on my phone. When iTunes Match came out, I downgraded to a iPhone 5 32GB (was really toying with the idea of 16GB). Stayed with 32GB on my 5S and really regret it. For the past 6 months, I've been getting the out of space message. I take a lot of pics/videos and never delete pics or texts; I currently have ~12GB of photos and 4.5GB of messages. So, for the 6, I went to the 128GB. I will never have to worry or delete anything anymore.
Then it's perfect for you! I used to do that until I needed to store huge map grids for offline use (part of my job). Like you said, you just have to keep your stuff organized and stream when it's feasible.I don't have a problem with a 16 gb phone. After deleting all of the apps today that I never used on my phone, I have 6 gb of space left. I stream my music, and I don't watch videos on my phone. I have a few short video clips and a lot of pictures.