well... i know that the swiftech ultra kit is a brilliant one for the budget, only u would have to either drill 2 holes or if ur case has it alredy, pass the holes for the tubes through them... and yes, it should be able to cool ur 8800gts fine, u may need a different waterblock for it tho...
edit... i think ur case alredy has the water cooling holes, the radiator will just sit on the back of the case... so no mods needed...
hope this helps