to Gem: woops, typo, i meant to say the 122 has higher top end if you use it with the same sails as on a 133. The 133 will plane earlier though and have a smoother ride is low winds.
to seacharp: i don't think a 42 would cover it. You'll need an extra 44-46 for the 8.5. The 48 slalom fin of the 133 (the R13 totally sweet fin)would cover almost the entire range you sail, i think.
Haiko, AKA crazychemical