Does the 16gb version of the iPhone 6 have enough memory?

I would have probably 800-900 pictures, around 15 apps(no games, just social media type), MAYBE 300-400 songs but I mostly use pandora, and all my texts and emails and stuff. Is that enough storage or would I need 64gb? I don't wanna spend extra money.

Transferring data to new iphone using itunes - but still using old phone?

I have an iphone 5 and now need to transfer everything over to an iphone 5s
I tried icloud but it said I didn't have enough storage to complete the icloud backup.
I then used itunes to backup everything on my old phone,
However, my EE number is being transferred and will take up to 48hrs so I'm unsure as to when my old phone will become inactive.
Can I backup my new iphone using the itunes backup, but still have access to the messages/photos on my old phone?
I will be at work tomorrow when the phone number is being transferred so ideally I would like a phone that I can use.

Is it worth it to get the screen replaced on my iPhone 5c?

I dropped my phone yesterday. When I picked it up, some of the glass started to pop out near the top. I tried to turn it on, and it went to a dark blue color. The screen is blank, so you can't see anything. My phone still works. I can hear texts and calls coming in so I'm pretty sure it's just the screen. It would be $130 to replace it. I have the cash now. I was going to get a new phone as soon as I found a job. I had an interview last Friday and if I do get this job, the grand opening is not for over a month, so i'd be without a phone for a couple months at least. Do you think it's worth it to get the screen replaced? Or wait until I get a job and just get a new phone. If i got it replaced I'd obviously have to stick with the 5c a lot longer than I originally planned.