I'm waiting for the networks to come down with the hammer for those who illegally tether. For example, some Verizon plans include tethering in your usage and they don't care how you do it. Other plans, notably old unlimited plans, the TOS requires a $30 extra payment to tether. Some people jailbreak in order to tether and avoid the charge.
Wait for 6. If you then can adapt to 4.7 inch, you wouldn't disappointed. 4.7 is not that big and it's easier to adapt on your hand than on your eyes, bigger screen is always nice. But if not, you can get 5s 64 GB for cheaper price.
I believe the iPhone 5S will come with the newest iOS 7.1.x. And I propose also waiting for the announcement of the 6, then all the 5S's will go on sale. Its a perfect opportunity to save some cash if you don't mind the wait