So all my plane blades need their primary bevel re-ground, now that I have an idea of how to sharpen and what I want... It’s been taking me forever on 80grit sandpaper (duh) and I haven't even
started with the HSS blades... So I have decided to get a grinder, and I have a few fundamental questions:

1. 8" or 6", does it really matter?

2. should I really spend the time looking for a slow-speed model? (first scout sees non)

3. is it worth trying to find a hand cranked model? why would I want one over a power model?

Pls remember I'm in Israel not the US.