Just discovered this topic, so here's my input:
I surely win the prize for cheapest machine - a 90-dollar-flatbed CANON Lide 110.
Hooked to a Sony VAIO notebook running with Windows 7.
State-of-the-art-setup though...
I "post produce" the pages with an automatized Photoshop run correcting tonal values (is that the term?) and scaling down page size.
I am quite happy with the results: readable, sharp and clear panels.
They are lighter than the original book, just a bit yellowed, which is perfect in my eyes.
I don't care for scanning speed, cause I process only one book per day.
It's a labor of love. Most of the time I spend trying to get a STRAIGHT scan out of those crooked, slantwise printed books.