let me just make sure, you can fit to gtx 285's watercooled into a lian li pc-888?
Sure - the PC-888 handles an ATX- full tower motherboard. For these types of mobo, the card sits (horizontically), well within the mobo footprint, hence the case. Of course, the mobo is removeable - and you'd probably have to take the watercooled cards off before doing that.
For my water-cooled GTX - 285's, I use the pre-modded BFG NVIDIA GeForce GTX-285's. I have 2 sli slots occupied by the GTX 285's, while the bottom SLI slot is populated with an NVIDIA Tesla (C1050) GPU. I'll be upgrading to the Fermi card (C2070 - GB) GPU when it comes out in a few weeks.