hmmmm, are you sure it is complete raw water cooling? Mine has fresh water cooling, but salt for the radiator if that is what is is called per say. I do understand the original sails issue too, as I had them also. BUT, nice thing about a boat with older sails vs newer ones, if the newish ones are say partial battans, and you want full, then you do not have to refit, or buy a new main! Or if they stayed with hanks, you want an RF system.......
Some good and bad to the options obviously, anyway, for me it had been 10G in new sails, main, spin, 110, 155 carbon, in so far, along with a 140 high cut cruising and a 130 reacher coming in the spring. I do some racing, hence the 155 carbon and all of the sails I own etc.
Good luck on choice!
She drives me boat,
I drives me dinghy!