I want to get a water cooler for my asus 6850. But i want one with a radiator that will fit a 90mm or 92mm case fan slot which ever one cases take. I already have a corsair h60 at the front of the case and it has taken up the 120mm fan slot, so i only have room for a 90mm fan and radiator at the back of the case, and one on the side of case panel. No case modding or upgrades will be done. Anyway graphics cards usually have smaller fans than processors do, so i wouldn't understand why they wouldn't want to make a 90mm radiator and case fan water cooler. I find watercooling great, not mainly because of the performance in cooling, but because you can put the radiator and fan right on the side of the case so it brings cool air directly from the outside of the case. I prefer not to use a 120mm to 90 mm fan adapter.
unfortunately as my corsair h60 is at the front of the case it is blowing hot air from the cpu directly towards my graphics card and so it is heating up more than is acceptable. This is why upgrading to another air cooling fan sink isn't really an option because the cooler is only as good as the air coming towards it.