Please need help in knowing what are the best hand grinders for making whole wheat flour.
an excellent review of practically all manual grain mills can be found at this link http://www.grainmillcomparison.com/
you can also use the search box in TFL - there have been many threads on this topic
I've been quite happy with my Country Living Grain Mill. It grinds wheat into flour plenty fine enough for making bread in a single pass, and if you run the flour through it a second time, even the bran comes through powdery-fine:
Country Living Grain Mill
I thought about motorizing it, but it really doesn't need it. The kids can turn the crank easily too.
In England I use an attachment for my Kenwood Chef Mixer. It's a bit slow as you have to let it cool down every five minutes or so. But it works very well and you can mill coarser or finer.