Now that you mentioned it, I find it a big problem. I can't find any waterblocks for 8800gts/gtx that would fit. I suppose I could use the vf1000 but I don't like the price or the fact that I w/c all my PC except the most powerhungry component. It just doesn't make sense.
Have you considered the D-Tek Fuzion block/ heatsink? Some right angle connectors or some flexible tubing and it should fit fine
Remember that the NSK2400 will need some modifications to fit a 8800GTX in terms of the cards length, It should be fine if you remove the front HDD section and mount the hard drive under the optical drive instead.
It takes some work to get everything in the NSK2400, but I personally think it's well worth it. Mine's been watercooled since I got it about 18 months ago, although it's on air at the moment as I've just upgraded to C2Q and X1950 pro. I don't have any pictures online at the moment but I can upload some if you'd be interested to see how I've done it