SDG I-Beam Seatpost
The SDG 2014 aluminum I-Beam seatpost offers tilt positions in 5-degree increments. Additional positions are possible. Leave post in bike and take off clamps completely. Move clamps to opposite sides of post and reassemble. Clamps work well in either direction.
Light weight and like the I-beam set up so much better than rails. Doesn't soak up bumps as well as a railed saddle though if that is a problem for you. Just with they would bring back the cowhide print saddle back.