You could defenately do better for the money. The zalman's base looks super thick, and doesn't seem like it would transfer heat very well, plus it has an adonized aluminum top which I don't really like because of the possible battery effect. I'm not sure about the polarflow. I can't find any pictures of the inside of it. You'd be better off with a maze 4 or a TC4. Also you might want to employ the search button. Somebody has probably said something about those two blocks.