asterisk users - Apr 2011 - [OT] 802.11x roaming

Hi, I'd like to replace my DECT + fxs phones with some wireless phones.
Main problem is: what about the roaming from one ap to another? Do
someone adopted the 802.11r standard? What APs and what phones do you
suggest me? I'm open to suggestions but I'd like to avoid proprietary
solutions, I don't want to be bound to any hardware vendor. My switch
does support spanning tree protocol.

Thank you,
Darkbasic