It will be really hard to use all those sails with one board, you're asking a bit too much (4.5-7.5). My guess is Futura111 for 5.5-7.5, it will take you a bit further into lighter winds. I know Futura101 is quoted up to 7.5, but at >100kg, I don't think it's a good idea to overload the board with max sail. I doubt you'll enjoy it much.
Then get something smaller for sails <5.5.