You didn't say what size the MB is that you'll be putting in the case. If it's a standard ATX or ITX, or even M-ATX, then the NZXT Source 530 might be a good option for you. The case is designed around airflow, and according to the write-up, "Fits large water cooling radiators up to 360mm in size. Native support for the world's largest all-in-one liquid coolers, the 140mm / 280mm NZXT Kraken."
It won't fit an EATX or larger MB, though. Still, if you don't need the bigger MB, it's an awesome full tower case and only 89.99 at newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811146114
This was does indeed fit the Kraken 60, though, and you won't beat the price on a case that fits the Kraken 60. It's a smaller case for a full tower, though. Only 3 5.25 external bays, and only 6 internal 3.5 bays, with a 2.5" SSD mount behind the motherboard tray as an extra.
If you need a bigger motherboard, this isn't your answer. If your motherboard is ATX or ITX, this one's a good choice.
Takes a 200mm fan on the front (with filter), or 2x120mm or 2x140mm fans on front.
Takes 2x120mm fans on the bottom.
Takes 1x120mm or 1x140mm fan in the back.
Takes 3x120mm or 2x140mm on top.
Also a spot internal for a pivoting 120mm or 140mm fan.
Air filters for all intake fan positions to help keep case clean.
It can fit a 280 or 360mm radiator on top.
On the front, it can fit a 280mm radiator, or 2 horizontally mounted 140mm radiators.
On the bottom, it can fit a 240mm radiator as well.
Not to mention, a 140 or 120mm radiator can be mounted on the back.
Lots of space for radiator surface in the case, much more so than in most cases. All this without modding the case.
Might not be a bad idea as you can use a 360mm to cool your CPU, and still have room for a 240 and 280 to cool 2 GPUs.
I got this case, and with the money saved on a case, I'm able to afford more fans, better fans, and a better liquid cooler. Very satisfied.