GTX 970, medium to high settings on most games at 1440p. No Ultra except on the very least demanding titles. If you want 60fps on very demanding games, you'll probably need to use medium settings. No way you're getting near your refresh rate with your FPS though, not at 1440p. Probably not even at 1080p depending on how demanding the game is. Less demanding games you'll be able to match up.
And yes, the 144hz refresh rate of your monitor IS a factor, if you don't want tearing.
Do you already have that setup, or is that what you're planning to get?