NordicJedi Largely depends on the fans you're going to use. 25mm fans, and you can do practically any controller. Heavy delta's and you'll need something a lot stronger. If you plan on splicing the fans together, you'll need something that can put out a lot more Amps/Watts on each channel. The best controller out there, based on a large number of reviews, is the sunbeam rheobus extreme 6 channel. Puts out 30w of power each channel and is very responsive. The lights on the ports are bright, but there are mods for that if needed. Another is the Lamptron FC-2. It has 40w per channel, and does not have the brightness issue. However, some units seem to acquire a bad squeal if running less than 100%. I experienced this, and a few others I know experienced it, as well. Otherwise, you might try offering more information, so we can understand what you want to power, and what you need out of the fan controller.
eppopipe Agreed, the Sunbeam is the way to go, However they are cheaply made. I took the traces off the circuit board on mine and replaced em with real wires. Takes my delta's like a champ now :) Oh and if the lights are to bright, you can just paint the knobs with some VHT Nightshade, or whatever paint you like.