Before you buy the charger and case at Verizon, hit up the local Five Below or look online. I got my case and extra iPhone charger at Five Below. The case I have is from
https://www.speckproducts.com/ and it's great.
The one thing I ran into when we upgraded our devices was my 6 year old router couldn't handle all the traffic. At any one time, I have 4 computers, 2 iPhones, an iPad and a Samsung Galaxy Tab 10.1 going at the same time. I grabbed a wireless-n router from Newegg for $30 and it's been great. Not saying you'll have to do the same (I've got an overkill setup), but something to keep in mind.