That config will be fine, but adding another side vent/fan for your GPU is a good idea.
Some things to remember:
- You want a good seal between the Kraken fans and the radiator. Make sure the rubber gasket is installed and sealed right. This will help reduce air leaks and keep the statuc pressure/vaccuum up.
- Kraken fans will vary in speed. You'll likely have positive case pressure at idle/low loads and neutral-to-negative under full loads.
- Pull config on a radiator (what you are currently using) makes cleaning dust from the radiator intake surface much easier.
- VRU and chipset cooling may be an issue with radiators. Most CPU air coolers move enough internal air over the chipset and VRU heatsinks to keepo them cool. Without a fan they are more prone to overheating. Look into something like another side case fan or an Antec Spot Cool to blow onto them.