Well, I've just ordered myself the Gainward GeForce 6800GT GS SLi CoolFX pack at a bargain price (think about $300 in real monetary value). I'm planning to buy myself a Lian Li V1000B as well, and I want to mount the 2x120mm rad in the bottom section of the case, where the HDD's usualy are. I HAVE seen a thread where someone has done this before, but finding it is another question. So, if someone knows where I can find pictures of this being done, or any info on it being possible; please post it here.
If it's the thread I think you're talking about, it was a triple. In any case, it's quite possible. In fact, I think FrozenCPU's "bucky edition" Vxx00 cases do just that. Depends exactly how you want to do it... there are quite a few options that would all work.