Fan controllers are ok, I have a Zalman ZM-MFC2
, which is very nice, but you may find you don't really use them. Mine has 4 slots, but can support dual fans on one input (although only one splitter cable is included). The thing you have to worry about is overloading the fan controller. I've heard reviews of the Scythe Kama
, overheating and being a fire hazard when overloaded, for instance.
The other problem is that you'll have difficulties with power saving modes (standby), as the fan controller works independently to the mobo.
As for my controller in particular, you might find it annoying if you want to be adjusting the speeds a lot, as you press buttons, and adjust a floating dial, so something more 'mechanical' might be to your tastes (such as the mfc1). I just like mine as it has thermocouples and a power meter.