I like the Xigmatek 1283, one version is called the Dark Knight. It is tall like most of them but I had no problem fitting it into my Antec 300 case. If the fan hits your heat spreaders then you have 2 options- move the fan up slightly which the rubber attachment things will allow, or put the fan on the back side of the heat sink and let it pull air out instead of pushing it through. I've built i5 machines with it done both ways and they both work fine. (Actually the raised fan was with the 1284 heat sink). Some people said the "puller" arrangement wouldn't work as well as a "pusher", but it did work fine and kept the temps as low as a normal pusher arrangement.