Aquaman and The Sub Mariner (Part Two)

I wonder which of these two characters will be the first to get their own big screen film?  I've heard Namor bandied about as a potential future Marvel flick and Aquaman was famously brought to fictional cinema in Entourage as well as guest shots on Smallville and an unsuccessful TV pilot.  A big budget picture for an underwater superhero would face a lot of hurdles.  Underwater shoots are incredibly expensive and there's also the question of how to have the characters speak beneath the depths - easily handled in a comic but a lot tougher to make work in live action.  Both characters have famous looks that have their own challenges to pull off - making Aquaman's togs look cool and finding someone who can both act and look good in nothing but swim trunks and ankle wings.  It's a lot to overcome, but if done with care we could have a superhero movie unlike any other.  I'm betting we see one of them as a co-star in a team flick before a solo outing though.