hello all! just trying to get recommendation of the best rad for the $. I need a x2 120 rad and I'm between the swiftech mcr220-xp or koolance high flow. basically i understand the difference between them one having a brass core and the other copper. while brass has a thermal conductivity of 109 units of heat being dissipated while running @ 25c, copper has a 401 units @ 25c, but i would like to know of any issues or bad experiences of those who have used either of these. Thnx.