I recently ordered a Matrix Amplification FR12 FRFR-speaker. It's supposed to be really light weight and only wheighs about 13kg (28.9lbs). I've read lots of positive feedback about these speakers online.
http://uk.matrixamplification.com/fr12.html
They also have a 10" model here:
http://uk.matrixamplification.com/fr10.html