When considering a bigger board keep in mind how it will affect your toeside riding.
Very wide boards will be harder to ride toeside.
A few companies have started to make asymetric outlines and a couple asymetric flex.
Flyboards and eclipse have asymetric board outlines.
Just look down ot your feet and you'll see that the front and the back of your feet are very
different.
When riding a surfboard riders will more their feet or at least one more towards the rail on the toeside so as to edge better and put more strength into the rail.
With a twin tip you ride in the straps at all times (unless you are falling

)
This is why an asymetric outline helps.
The board will edge better when on toeside and on "hop to toeside and carve" transitions.
An asymetric board actually feels more symetric under your feet.
Also having a more ridgid rail on the heelside will make the board more efficient when riding heelside.
Concave is also important as it will help a big board track better and be smoother on chop without
relying on efficiency eating flex.
http://www.flyboards.de/Content/471/?mnid=1734
http://www.eclipsekiteboarding.com/site ... sabre.html
Another option is an ultralight hollow carbon fiber surfboard amde by Aviso.
These boards have loads of floatation and a unique flex pattern.
These boards have very riding rails, but a flexible hull.
This gives the boards great precision and efficiency combined with an amazingly smooth ride.
Another cool thing about these boards is that you can tune the concave in the hull by pushing more or les air in and out of the vent plug.
I will tune my Avisos to a deep concave for low wind and upwind preformance with great tracking.
For a more powered up session where I want a loser board I will let more air in ... great for a smooth and lose downwinder powered up really nicely.
Great thing about these boards is that a 6'6" Aviso surfboard is lighter than many average sized twintips. This makes the boards very nimble and easy to swing around.
Turns quicker than low wind twin tips and goes upwind so well with the flex in the hull along the cnterline just smoothing out the chop.
www.avisosurf.com
A board to look out for is the Slingshot Celeritas comming out soon in an Aviso edition
One last thing.... ona big board ...twin tip... construction quality is very important.
Some are definatly "overweight".
www.spleene.com and
www.flyboards.com are really well made and really last for ages.
Theyreally keep their flex pattern for years. Both also have low wind in their "heritage".