RE: iSonic105 technical ride
I think you will find that the iS105 and the HS133 has about 97% overlap at your weight. If your biggest sail is a 8.5 I really don't see a need for any bigger board. On the other hand, if you want a board that complements the iS105 I think you should look at something like the smallest Kombat. or maybe a pro-kids S-Type from last year.