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If floatation is something you are considering, then look at the Anthem. Anthems are just fatter Invaders, so they will have that flex that you are looking for.
The Afterbangs are replacing the Invaders, so I would expect their intended uses to be the same. The gem of Afterbangs is the new 'skateboard' construction, which is designed to give the ski a unique, park oriented flex. Don't let that distract you though, you will still have a wonderful, tried-and-true flex pattern from Anthems.