If you backed up your blackberry with DM, can't you restore it, then go the google sync route?
I ask because I don't believe there is a way to simply and easily get the contacts out of dm, but it is fairly easy to securely erase your blackberry so you don't have to take out back to verizon. If you set a password, then enter it wrong ten times, the bb will erase itself. A handy security feature...
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