Unless you ONLY want to paddle flat water-I would be carfeul of any board under 28 inches
with the Starboard range - and extensive r and d 30 inches is consistently popping up as the magic number - even the 9'8 is 30 wide - it gives you so much stability- and -with some clever shaping -alot more outline curve to work with to really give the board some extra turning power. This means you dont have to rely on slow paddling (rocker kills your glide) over rockered boards (that dont really paddle too well) to get really good surf performance
Here is the 12'6 Starboard in action - a long board with good with and rocker that surf's really well!
any board under 27 inches will be quite alot more dififcult to balance on- but -with appropriate rocker- will have really good glide and penetration through the water. I would recommend NOT getting boards of this width unless:
1. you are just into flat water- Narrow boards "cut" through the water nicely any you will get some good distance over an hour-however narrow boards really dont perform particularly well in the surf.
2. You are 70 kg or less or have incredibly good balance.