The 3.3 Kaos will rig on either a 370 or 400 mast as it has an adjustable strap at the top - luff length is 352. It needs a boom which will go down to 141. So most people will have a 400 mast and an adjustable boom which goes this small. I am not quite 70kg so figure either myself or my partner, who is a novice, will get some use out of the 3.3. I figure that on a 40+ day I'd be looking to use it.
Because it was old stock (2006 model), even though brand new, it was way less than $1000 - in fact less than half that from memory.
But when giants like Tony Wynhoven were rigging their 4.4s on Big Sunday, then the runts like myself need to go significantly smaller in order to be able to sail.
I was out thursday windsurfing with my 5.4 with max downhaul and out haul and i was windsurfing along side some guys who had 4.0s
most the time i felt in controll, just a few times i got a little over powered..