best macbook specs for my money & purpose?

I want to buy a Macbook Pro (a 2014 or 2015 model) to run Windows via Bootcamp. This will be my primary laptop and it'll have lots of videos, photos, music, etc occupying a lot of space, so I'll be getting a large hard drive. I'm not a gamer at all.

What's most important when it comes to the RAM/processors for this to run Windows (probably Windows 10) smoothly? Would an i7 Processor be worth the extra ~$200?

As a point of reference, I'm considering buying this:...

best macbook specs for my money & purpose?

best macbook specs for my money & purpose?