If I felt the need to stand up and pedal to get up a hill, would the Curve handle that situation OK? Would stock parts be in danger of breaking, or would the bike be in danger of falling apart?

Has anyone ever tried the Biologic suspension seat post? That one is $45 compared to the Thudbuster which is $140 at ThorUSA: http://www.thorusa.com/dahon/accessories/seatpost.htm