Also trying to decide on a vintage GEM razor. I'm between the GEM Damaskeene and the Ever Ready 1912, any experience with these?
Both are great razors, dirt cheap if you're patient, and fairly indestructible unless you step on one. There isn't much difference between the GEM 1912 Damaskeene and the Ever Ready 1912. The Damaskeene has a more curved cap. A search will lead you to loads of information about the various 1912s. Make sure the blade stops are intact; some of these things are over 100 years old and the early stops were small to begin with.
I shaved with a GEM 1924 today - bbs with ease on a week-old blade. Other GEM/ER options are the 1914 Little Lather Catcher, the various Micromatic TTOs, the G-Bar Heavy Flat Top, the Featherweight, and the Pushbutton.
Vintage SEs are plentiful and cheap, including most Schick injectors. If you want to try a good middle-of-the-road Schick, look for a Type I (that's i, not a 1); the Type I Hydro-Magic opens up for rinsing.