Water cooling fan controller

Hey guys, I am looking to upgrade my rig/cooling.

Currently I've got a NZXT Phantom 630 with a built in fan controller on the back of the motherboard tray.

In this case ive got a simple 360mm rad to cool the cpu.

Im going to upgrade to the HAF stacker and have 2 360mm rad's and to cool my gpu as well.

Simple question is:

What fan controller should i buy to control all 6 fans?

Not that it should matter but I live in the UK so if you could find a UK page then that would be fantastic.

Thanks for your help.

Ben.

That case is way better than the cm stacker in every way. I would highly advise to stick with the 630. It is such a great case and you'll regret going to the c.o.d case haf stacker.

Your wc rad options are as follows:

Roof    120.3 or 140.2
  Front   120.2

Rear    120.1 or 140.1
  Base   120.2 or 140.2

(source - oc3d review - http://www.overclock3d.net/reviews/cases_cooling/nzxt_phantom_630_review/1)

Which is more than enough for a cpu plus a gpu (or 2).

As for controlling fans - just stick to voltage reducers to run at a voltage that will give you the temp/noise level that is desirable. Either that or do something like 3 into 1 fan extension then to a mb header then control via bios / software (if applicable). I cant recommend a fan controller as I dont see the need for them.

Ok, I really want to give this build a go so thank you for your suggestion. 

Its not only because of more cooling but also for a kind of test/exploration. 

As I have only done this one W/C build before so I would like to give it a go.

And many thanks, I think I will do a PWM based control as suggested.

Thank you.