@lee1972,
I have had a 92/ 93 Freestyle Wave they first came out. I usually upgraded every season as every season they slightly improved the board.
The biggest change in my opinion came in the '08 model. They really managed to pack a lot more wave orientation into that board while keeping the top end speed the same.
I currently still have the '08 model but I am thinking of upgrading to the '10 model... depending on how it performs.
Despite what people will say here about Starboard vs. JP as far as performance goes the Starboard Flare doesn't even get close to the characteristics of the JP FSW.
Yes, the Starboards have some really well thought out details such as the foot straps but in the performance is what counts. And the FSW wins that hands down every time.
In a nutshell the FSW planes early, turns on a dime and has a near endless top end speed. If you decide to get one of those get the pro edition! It's worth the extra money.
Also, the JP FSW is the type of board that will benefit from playing with different fins. You can really change the bias of the board towards more wave, freestyle or freeride simply by changing to a different fin.
RE fin system, don't know if US box or powerbox is better. However, last time I was at windsurf and snow and had a look at their very large selection of fins there weren't very many freestyle and freeride fins with US box system. Most of the US box fins they had were shorter style wave fins.
BTW, were do you sail most of the time? I am here in Sydney and sail mostly the South side (Wanda, La Perouse, 'Bra, Kymeeagh). You are more than welcome to take my FSW for a spin next time you see me at the beach...