Unless your phone is 100% dead and you have no back up phone, it is a terrible decision to buy an iPhone right now. Colossal waste of money. All the existing models should drop in price next month, even certified refurbished.
My girlfriend is still rocking a 6+. Touch ID doesn't work, the battery has been replaced once and it is still crap, Gmail takes 10 seconds to open, her storage is full, and last weekend she dropped the phone and the screen is cracked so badly you can see some of the LCD back light at the corner. It's in bad shape. We taped the sharp corner where most of the damage is and she's waiting until next month to finally retire the POS. If she can wait, anyone can wait haha.