Koolance TMS200 (0V-12V, software-controlled 24W max/channel (max 78W on all channels), ~$100 USD (have had some trouble with software)
Aquaero 4.0 (0V-12V, software-based, software independent, 10W max/channel (max 30W on all channels), ~$100 USD
There are a hundreds of controllers to list if you want to go all the way with this.

And i think that you should check martins thread. There are a lot of fans there you can list if you want. And also price you should set to ~$10 instead of $10 for example.