Hey Gorgo
I threw on the 9'5" on the scales but the are not the best. It came up 11.8kg. I have seen people mention the 9'8" Starboard aswell
It comes down to stability, your weight and what you want to do.
I am 92kg and 6' tall and for me the 9'5" mana is good in the in the chop. I prefer the 9'6" naish to surf with but in the arvo chop I have a better time on the mana. In about a year I plan on dropping to the 9'3" or custom. I do not think my weight would be good on the 8'10" but then again people like JB ride it and I have been told he is similar weight. (sorry if this is wrong JB)
I have ridden the 9'8" Starboard but think the 9'6" surfs better IMO. I have also ridden the 9' Starboard stinger and was very impressed with it. I would choose this over the 9'8". It is funny how the 9'3" Naish is tippy for me but the 9' Stinger wasn't as much. Here is a picture from John Makkin from our club and he rips on the 9' Stinger.
The whopper IMO is a great board and will let you progress quick but then again IMO the 9'5" Mana surfs better and is very stable. It paddles well, though not the glide of the 11'ers but then again it is 9'5" and is used for surf.
For the lighter people who grew up not enjoying food as much, you might find the mana a bit corkie. But if you want it for a river paddle or small surf and don't want to get a hernia loading it on the car then it will be perfect for you. My wife 58kg, loves it for this reason. She had a 11'6" oxbow but could not carry it by herself or get it up on the landcruiser. The 9'5" fits in the Landcruiser

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I think all boards mentioned above are great and will suit diferent people better then some others will depending on the individuals weight, experience and what they want it for.
My advice is DEMO, DEMO, DEMO. Doing this on the 9'5" naish may be hard as they are selling like hotcakes.
I hope this waffle helps.
Latter
Swanie