That case has what could be called a boatload of top space.
You could without any issues use a H100i(you will need to get more quiet fans or turn the stock ones down a good but in the Corsair Link software) or other 2 x 120mm cooler up top.
I link here confirms the fan mounts are located on the too for it.http://www.overclock.net/t/1295266/correct-way-to-mount-h100-in-a-haf-x-case/0_40#post_17956422
You can then leave the stock 200mm fan to help pull air from the rad and the extra size would pull around the rad cooling the VRM area of the board a bit too.
A 3 x 120mm rad may fit, but I can not confirm it and it would only be held by 4 and not 8 screws.
Depending on your location(USA is out because of a stupid patent issue) the H220 and H320 are well reviewed coolers.http://www.swiftech.com/H320.aspx
Many people have gone full custom in that case too.