Nightfall Axe

i know ive heard of a few other tankadins using this and i should have mine by tomorrow so my question is:

what enchant do i put on it?

i was thinking either counterweight or mongoose since haste is the key thing for it

any thought of one vs the other other than counterweight is hella cheap?
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Since there's already a topic on Nightfall this question should be asked there:

http://www.failsafedesign.com/maintankadin/viewtopic.php?t=1961