I've got a pair of GIVI side boxes, but I am willing to consider any type of top box available.
You should check JC Whitney of all places , they have a givi COPY that a lot of folks on adv rider seem to like . and the price aint bad either .......
here's a link http://www.jcwhitney.com/MATTE-BLACK-TRAVEL-TRUNKS/GP_2010969_N_111+10211+600014603_10111.jcw