The Gem Junior Bar is my favorite, but it's a bit hard to find one at a good price, I just got lucky. I also like the the 1913-14 Kampfe SCS Lather Catcher, which takes modern blades. It's a little hard to find, though.
Gem 1912s, or the identical 1912 models with the Star and Ever-Ready brand names are easy to find at low prices, pretty much as good as the ones above, and very easy to shave with. Mild is as mild does; they take the whiskers right off, but they are very user friendly.
I actually haven't found a Gem SE that I couldn't get a good shave with. Even the "too mild" ones like the Bullet Tip Micromatic, or the Contour II, will do a good job once you get the hang of them.
“The world wishes to be deceived, therefore let it be deceived.” - - Petronius