With more radiator surface area, you can run the fans much slower and get the same temperatures. With good static pressure fans you could run them very slow considering the radiators are slim and therefore there is less resistance. I would grab two slimline 280mm radiators with Noctua Fans. You would get amazing temperatures I would think and with fans that quiet, you could crank them up for good airflow over the motherboard and such. If you choose a 30mm radiator, I would not go for Push/Pull as there will be little improvement.
Good Luck