Welcome and best of luck. I do restoration work, and I know how much gruntage is involved in old houses. (re-plastering.... *shudder*)
I like SunTuf roofing, personally. I re-did an entire greenhouse roof in it about three years ago, and the new owners of the house are still very happy with it. We use it here in Ecuador as skylight material for houses and decks, and it stands up to our torrential wet seasons quite well.