A single 360 rad isn't enough for a CPU and two GPUs. You'll need two 260 or 360.
To keep everything as cool as possible, you could go
res>pump>rad>cpu>rad>spit into both gpus>merge into res
I think if you add another rad and 2 gpu blocks, you might need a bigger pump as well.
hmm... u sure it's not enough? I've seen many water cooled systems online with only one 120mm triple rad supporting one CPU and two GPUs. I guess I can also mount a 120mm single in the back for the CPU if I have to.
For about $55 each, you could run 2x Swiftech MCR320's (which is what I run) with lower speed fans. You'd need 2 radiators, but you wouldn't be pushing the limits of a single rad using jet engine fans to cool it.
A review I read says that Black Ice radiators work extremely well with high CFM fans. So I think I will just use a 3x120mm rad for the GPUs and a 2x120mm rad for the CPU. The 3x1200mm rad should fit inside the case, the 2x120mm rad will have to be mounted out in the back.
You are going to want something that moves 70cfm or more for those BIX rads. If you are running 2 rads anyway, just use Swiftech rads...they are cheaper and perform great for the price. Plus, you don't need turbo fans on them, just modest CFM ones.