I agree with others above, Ken is right wrt quoted sail ranges (6.0 on a 122? No way). I am 86 kg and I use iS122 with 7.3 to 9.0 sails. I think 7.3-7.5 is about the smallest I would like to use, that's when there are strong gusts, but I also need big board because of the lulls/currents/slogging, etc.
You say you'll sail in good winds, if it's steady most of the time, consider an iS111. It's just about perfect for your 7.0-8.2 sail range (and it has a certain "alround" quality, more so than a 122).