I forgot to mention one thing. With 60mm rads, static pressure optimized fans are must.
Noctua, Corsair SP, or even new corsair maglev fans are going to work. don't even try airflow optimized fans.
Also, for convenience of cleaning (and it's not important from performance point of view), put your fans in pull config (between the case and rad, so they will pull the air through the radiator out of the case)