Don't know about the flat water bit but:
94kgs
iS90 5.0 - 7.0 (6.3 nicest combo)
iS97 (two piece

) 6.3 - 7.8 (7.0 nicest combo)
iS110 7.0 - 7.8 (7.8 nicest combo)
iS117 7.8 - 8.6 (8.6 nicest combo)
Also have 49cm speed board which has been used once and hopefully will get it out again next weekend at Burrum Heads.