I'm looking for a good heatsink for my i5-4670k. I have a NZXT Source 210 case (windowed) which allows up to a 160 mm high heatsink, but I have read some reviews, regarding some cpu heatsinks, like the 212 evo, that kinda scratches the window. I wanna try to find a smaller heatsink, preferable around 157 mm or smaller so I dont get scratches. I am going to be doing some slight overclocks, probably to about 4,2 or so. Thanks in advance!