Truvativ Stylo T20 Seatpost
Truvativ's entry-level Stylo seatpost offers many of the same technologies as the more expensive models, but at a more affordable price. Designed with a 3D forged and butted 6061 alloy shaft, the Stylo T20 minimizes weight while offering aluminum's proven strength and security. The head is also made with forged alloy, along with a dual-bolt design with both zero and 25mm offset clamps.
I have a few of these. They not too heavy, a good value, and make it easy to adjust the seat angle.