I’m running on Titan X, it’s a better than 970. What I’ve read about it on Reddit, my impression was, that it is sufficient. It’s not perfect, but it works as it should be. It is not recommended to crank up settings (if possible) in games. After all, it is “recommended minimum” for VR.
Games? I like small quirky games, my favourite ones are:
Audioshield - http://store.steampowered.com/app/412740/
Space Pirate Trainer - http://store.steampowered.com/app/418650/
Project CARS - http://store.steampowered.com/app/234630/
This guy IMO nailed the review of the Vive. He really spoke how I feel about the HMD
He also made a follow up with some questions answered.
I like it, but it won’t replace my gaming habits anytime soon. Not at least when the screens get better and GPU performance in VR gets improved as well.