For a pure chassis fan the AF140 is ideal. For CPU or water cooling I recommend here the SP120 series from Corsair, as they are specially designed for short fins! Use this to remove the back of my Towers to the air, so does the fan whisper softly. With AF and SP series from Corsair, it is possible to adapt different colored rings, this is a nice gimmig and more what modders. On what to watch is the 3 pin cable connection, think this falls very short (about 20cm). Either you have a FAN connector on the top or right on the left edge of the motherboard, or you have to work with extensions.
I use as the Tower Corsair 800D and was due to the brevity, not clean route the cable behind the flashback, but had it above on the housing long run.
