What do you guys think for a nice looking cooler/fans

What should I pair up with it?

Thinking Corsair LL120 RGB and replacing the front 3, and I kind of want to go with either corsair h100i or dark rock pro3 air cooling this is for a guy that likes the look of something more than what's inside (although it's going to be being built high end internally).

What do you think looks really smooth here?

Get 460x unless you're on a 99 platform IMO. Then get the NZXT Kraken 52/62 because they have RBG on the pump. Then just get some rings to put on the fans for LED there.

Doesn't the 570X already come with 3x 120mm RGB fans on the front?

As for the cooler I would go with the Corsair H100i V2

The RGB fans are the SP ones. They suck. You want the LL or HD fans where each LED is controllable.