Should I buy an iPhone 5s now?

I'm in need of a new phone but my budget is limited. I must get an iPhone, there's no other option, so I'm thinking about the 5S. My main concern is that it may not last for long since its kind of old now. Would anyone recommend buying one?

If I have an iPhone 5c, and my upgrade is in August, can I wait till September to get the iPhone 6s?

It hasn't been confirmed yet if the 6s will be out in September but if it does or even if it comes out in October, will I be able to upgrade to the newest one?
Or will I only be able to upgrade to the iPhone 6?
I wouldn't mind the 6 but the 6s will have a way better quality in picture and I love to take picture of my daughter.
So can I go from the 5c to the 6s?

My carrier is Sprint and I have he unlimited everything plan.

What to get for Wi-Fi extension?

So I heard about Wi-Fi range extenders but unfortunately I read that it's slows the Internet speed, so I bought a powerline instead. I found out when I setup the powerline that the connection goes only to the device the Ethernet is connected to. Does anyone know a power line that even when you connect the adapter to your computer, I could receive Wi-Fi to different devices wirelessly like an iPhone

When will the iPhone 5S stop production?

When will the iPhone 5S stop production? - 1

Added (1). The iPhone 5C is gonna be booted out this year in 2015, i WANNA buy a new iPhone 5S to replace my stolen old one, do you guys know when.

Can I use a max 250 volt adapter to charge a 5 volt device?

I'm going to Spain in a few weeks. I found a 250 volt adapter which is perfect for my iphone… But is it too strong for my 5 volt charging case? I don't want to burn it out. Sorry if this is a stupid question, I don't know much about electronics / engineering.

How to retrieve an iTunes backup from an old hard drive (Mac)?

My old macbook is broken and I took out the hard drive. I bought a SATA wire to connect the hard drive to my new macbook. I have an iTunes backup from the old hard drive containing photos that I want to retrieve. How do I access the old hard drive's iTunes and backup my iPhone?