iPhone 6s is Better & Cheap
If you haven't already, make sure you take a look at the iPhone 6s and iPhone 6s Plus before you commit to an iPhone 6.
The iPhone 6s and iPhone 6s Plus launched a year after the iPhone 6 and iPhone 6 Plus. They're newer, they're cheaper, and they have a longer shelf life.
Here are a few real life differences between the two:
The iPhone 6s and iPhone 6s Plus are newer but in some cases, they're about as cheap as the iPhone 6 and iPhone 6 Plus.
Make sure you rule these devices out before you go with one of the older iPhone 6 variants.