S7 for $50 at Best Buy w/2 year contract

I'm on a 4 line ED 1500 for 200 a month and have two upgrades available. Should I take the plunge and use one or both of them on the S7 for or will something else better come along? The other two lines have a year left and I've had Sprint for while, so I'm probably not moving anytime soon.

I'm only tempted because root is now available and it looks like this phone is making progress.