Hi Papa Terry,
At 70 kg. (150 lbs) the Rio M with 6.5 and 7.5 m2 sails would be my suggestion.
Since you aren't getting any younger or stronger, I would suggest spending extra money on a 100%
carbon mast that fits both sails. Mast weight is ultra important to staying out on the water for longer for
those of us past 60 yrs. old.
Not sure where you are going to order all of this from. I can find no Starboard dealers listed for the Phillipines.
I guess you will have to import from some other country close.
The sails I would suggest first would be the Sailworks Retro, and if you are planning to teach, the best training sails available are the Sailworks Retro Rippers 1.2 m2-4.2 m2)
If you wish to stay with all Starboard brands, the Severne NCX sails would be good, however the "best" mast for the 6.5 is a 430 and the best mast for the 7.5 is a 460 but it suggests the 6.5 can be rigged on a 460 IMCS 25 mast.
Hope this helps,