OMNI seems interesting, if the baseplates are cheap. Something like that I could stick on one of the top ventilation holes and it wouldn't interfere with anything else. If they keep the ECO price on OMNI it'll become a tempting option with all of 'em HOT cards.
edit: price wasn't for OMNI
240mm rad too (these might become a hit):
[I]OMNI A.L.C. packages are available for a number of current graphics cards in 120mm radiator and 240mm radiator variations. Pricing varies with each graphics card type.