From my limited (well no) experience with water-cooling, there is no good water cooling kit for a "noob", because installing a water-cooling system is pretty advanced stuff. I myself would try to see what I can do with fans before even considering liquid-cooling.
the radiator in that galaxy kit is way too small to do any serious overclocking. same for the h50. i actually owned the corsair h50 and i just switched over to a real water cooling system. If you want the h50 ive got it sitting next to me right now.