Currently, I have a i5 4570 and a GTX 970 SSC ACX 2.0. If I were to upgrade my CPU to the i7 would I see any major performance jump, or should I just put that money into a nicer monitor or RAM (I have 8gb right now).
No, you wouldn't see a gigantic performance jump, unless you are doing something like streaming/recording/converting etc. Even upgrading the ram if you have 8GB wouldn't see a huge performance increase, I would definitely go with a better monitor, assuming yours isn't that good already.