I kinda want to future proof it for a little while - is there really not much of a difference between i5 and i7?
I'm glad you're listening and not stuck in your ways. I was in your exact situation a few months back. I wanted to buy a pre-built because of the convenience but ended up building one and couldn't be happier.
For gaming purposes the i5 is just as good as the i7 and is cheaper on the wallet. I put in a build for around $700 for someone not long ago I will find and post it shortly.