Amsoil 0w30 has been recommended to me as a year round option so long as I don't do anything more strenuous than autocross. With a favorable used oil analysis, I may be able to get a whole year out of one oil change. We'll see. It goes in within the next couple weekends.
Also recommended to me was the Amsoil EA020 (OEM replacement is EA012) oil filter. It has a slightly larger capacity and slightly lower bypass pressure than OEM spec filters. The justification for this was "do you really want a pressure differential of more than 21 psi before you get bypass oil flowing in an engine design known for spun bearings?" Sounded reasonable. Plus, it costs less.
Realistically, anything 5w30 should be fine if you change it regularly. 0w30 might be better if you experience cold winters.