That psu is very unreliable, and will not be able to carry your 970 very well if at all.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438059&ignorebbr=1
The above will do you well and provide the ability to upgrade your gpu in the future.
If you can squeeze it in an SSD along with your HDD will provide faster load times and boots and can even provide higher performance in some games.
Your hopes of achieving at least 120fps at 1440p on max setting is ambitious, but sadly, is not going to happen. At 1080p depending on the game, you will get close, but you will most likely still be able to reach 120fps at max settings on a game like Gta.
I'm not saying your build is bad, in fact the opposite, just letting you know that you won't be able to reach those speeds. However, I can assure the games will still look great on lower settings and you will be able to reach 120fps even at 1440p.