if you want a stupidly high OC while being quiet..i would not suggest air cooling, while yes you can get pretty high OCs on air itll never be as quiet as water.
but of your current listed 'sinks id go for the zalman..ive owned an alpha and i loved it...but i also had an old school zalman cnps 5000 which in its hayday could actually keep up with an alpha while being quieter...and would work wickedly with a high cfm fan..but the design made the noise unbarible...anyways myself id go with the zalman unless you reayy wanna fork out for water