First, what size GO do you have now? GO 145/150; Go 165; GO 185/200?
At 175 Liters, the Rio S does suit your weight, but the GO boards (even the smaller ones) will most likely plane earlier that the Rio S.
If you need the centerboard (to stay upwind in very light winds) the yes, the Rio S will
give you that.
I'm hoping to sail the new 2010 Rio S in the next week or so.
As far as what sail size, since your husband is buying you what ever rig you need I would suggest larger than a 6.5 m2.
Since you are small, and a woman, do all you can to get a 100% carbon mast to suit whatever sail you choose.
The difference in weight from an =< 75% mast in your 6.2 m2 Gaastra Echo to a 7.5 m2 NCX with
a 100% mast will be very noticeable.
If you feel the 7.5 m2 is too large, then see if you can get a 7.0 NCX Pro on a Red Line 100% 460 cm mast.
That would be about as light in weight as you can get.
If the 7.0 still seems too large, look at the 6.5 NCX Pro on the same 460 cm Redline 100% carbon mast.
Where are you located that there are not tons of used sails on the market?
Many of the remaining WS shops have lots of used sails (as well as closeouts and demo sails).
Another super light weight sail to consider would be the Severne Glide 7.5 m2 which should be even lighter and more powerful in light winds than the NCX Pro.
At 60 kilos (132 lbs.) you won't need too large a sail, but you will need a powerful sail that can get you planing very early.
If you are having issues staying upwind on the GO board you have, let me know and we can give you some techniques to try that will keep you upwind nearly as well on the GO with no centerboard as you would on the Rio S with the center board, and the GO will get planing earlier because it's lighter.
Hope this helps,
Last edited by Roger; 25th March 2010 at 12:07 PM.