Well, I have used a XBee Zigbee PRO SMA module before to connect a Waspmote with a Meshlium ZigBee-PRO-AP (It is a multiprotocol router) and it works very nice.
http://www.libelium.com/documentation/mesh_extreme/meshlium-technical_guide_eng.pdf
The advantage of use Zigbee Protocol is the low energy consume and the coverage radius.
Thank you very much for your advice.