Check out this recent topic:
www.seabreeze.com.au/forums/Windsurfing/General/Best-value-ali-boom/
Also worth looking at this one from about 2 years ago if you want one that lasts:
www.seabreeze.com.au/forums/Windsurfing/Review/Choosing-a-decent-boom-what-do-you-rate/?whichpage=1&replies=93&PageSize=30&mxPages=4
Julien what's your price?
Tecnolimitz best but $500 (phew)
then Chinook / Hydrodynamix at $350 ish
North Platinum at similar price is very very stiff
What about Naish booms, saw one the other day and it seemed to be pretty good - anyone got a monocoque one that can comment...?
AB...