The Citizen Eco-Drive Titanium Chronograph seems to tick all the boxes.
http://www.amazon.com/Citizen-Eco-Drive-...MYDTW49R0ZZW8QWI have the cheaper version.
http://www.amazon.com/Citizen-Eco-Drive-Titanium-Watch-BM8290-05E/dp/B000EQU0BO/ref=pd_sim_watch_1It is very lightweight and keeps the time resonably well. It has gained about 90 sec in the last 18 months or so.