I've got a couple of DOVO's (the Black Star and the Bismarck), and I have the Edelweisse you're looking at as well. The Boker's blade does feel slightly stiffer than the Black Star in particular, but other than that they are pretty much all the same to shave with in terms of the closeness of the shave and the smoothness of the blade.

All are excellent shavers as long as they are honed correctly (like most razors in fact lol..!), and will give you many years service if you look after them.

Between the ones you mention, they're all good, so pick the one you like the look of.

My personal choice from the razors you have listed would be the Edelweisse, but thats purely because I like the look of it more than the others..!

Good luck and keep us posted!