Super Flower Leadex.
As for extra rad, I've mounted another rad on top of the case, a lot of ppl don't like it and say it destroys the natural look and purpose of the case(but then they love other case mods, cutting cases to pieces, changing front covers, psu shrouds etc) but it does the job. one 480 rad wasn't enough for me, my idea of watercooling is keep chips super cool and case very quiet even under heavy loads. one 480 will be enough, but tou need to spin your fans quite high and the temps won't be very low. If you're gonna spend half a grand on watercooling parts make sure it performs great and give you a headroom, not just enough...
my temps are: 48°C cpu, max I ever had
38°C gpu, max I ever had
33°C max water temp
fans never go over 1000 rpm, d5 @ 3 speed