I'm doubting between 2 similar boards: iSonic 150 or Ultrasonic to buy one of. After I did read Ultrasonic description on Starboard site, I think that US is more accesible comparing to iS, but maybe iS maximum performance is a little better. I think, for instance, that maximum speed of iS could be higher, because shorter nose. Am I right? Could you compare these two boards? I need your advice rather quickly, because it is "last minute" to order "old" iSonic 150... I'm heavy windsurfer, above 100 kg. Remi, help please, I can't decide!