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meh...there are tons of different kits you could get for that setup, personally i'm partial to swiftech. and guess what, they just happen to have a waterblock with an adapter for your 6800.
check frozencpu.com for their kits...other than that you can just wait for other people to respond.
if i'm not mistaken the standard bigwater kit comes with 1/4" tubing, so if you want to spend the money you can stop by frozencpu.com and pick up an innovatek block for that 6800 of yours, hell it'll even come with LED's preinstalled ....that being said, you'd probably be better off looking for a good swiftech or dangerden kit that you could customize for your system