I'm going to try synthetic Mobil 1, after I search some more and decide on which weight.
I'd mixed up some 3-part (Dextron III/ kerosene, mineral spirits) Ed's Red for cleaning, and was happy with the results. Ed also lists a 2-part (50/50 ATF/kero) as a ER compatible lube, but I can't hack the odor of the kero. In fact, I used Hoppe's #9 after cleaning with ER, to get rid of the kero smell.
I was also thinking of moly grease (engine assembly lube) and found a bunch of guys like a product called Lubriplate.