Should I upgrade to iphone 5s from 4s or wait it out for the 6?

Ok so I have a white iPhone 4S and I'm still not eligible for an upgrade but sprint has a new program called Sprint one up where it allows you to upgrade to a new phone for 27$ a month/24 months and after a year, you give them you're old phone and get a new one. Ok I love my 4s but I'm so sick of slow 3G. It's fast at my house but at my school and everywhere else, it's So slow. And FYI I have sprint. Also there's LTE coverage everywhere where I live and it's blazing fast. I really want a 5S for the LTE. Should I go and try to go upgrade or keep my 4s and wait it out for the 6?

27*24=$648

or wait for your contract and pay $200 (assuming you are going to extend it)

I'm waiting for the 6 cause i'm so curious of how itll be. The 5 is okay. And the white 5s looks funny.

but if all you want is the finger lock than id suggest getting the 5s over the 6

"If waiting for the next version then you will always be
waiting"

Honestly I think you should wait. I mean unless the speed is unbearable and it's really important to have a fast phone (btw LTE sucks- I have a 5 and it never works, it slows my phone down), then you should wait. The 5s doesn't have anything super remarkable and you'll probably just want the 6 when it comes out anyway. I'm in a similar situation where my phone is slow and sucks and I want to switch plans and get the new phone, but it would cost way less if I waited for my contract to come up, and the new phone isn't offering much.