I'm running on a model such as this:
http://www.amazon.com/EVGA-GeForce-Quieter-Graphics-04G-P4-2974-KR/dp/B00NVODXR4
And i'm having a Wonderful experience at steady cap of 71 FPS which i set my self.
I have played over a thousand games, and gaming has been my passion for over 20 years.
I've spendt over $10000 the last 12 months on gaming, and thats mostly through buying games, contributing to "gaming charity", tweaking computers, and buying professional hardware.
I play 10 hours every day of the year, and i have not once regret buying this card.
If you have a monitor that runs over 2k resoulutions you will need a 980, and if you are doing up to 4k resolutions you will need a 980ti.
but if you are running on standards like 1920x1080 you will have more then sufficient graphics from a card like the 970.
Best of luck 