Thanx guys !
With only 3 persons in the boat (+/- 400lbs)and no ballast at 21mph, the wake was nice ! (look at the pic)
Next time i'll try to fill the ballasts (+/-1200lbs)and bring more people... The wake should be even nicer !
If you're considering buying a new boat, you should really look at Sfvara ! I was really impressed by the driving and the luxury of the boat !