I'm still using a Canon ("canoscan"), several years old, via a USB-1 connection. Aside from going on more red, please, binges every so often, it's been holding up. I like that the lid lifts for books. The scanning bed is pretty average, 8-1/2" x 12". I haven't seen any bigger than that.
Someone asked - at 100 dpi, a scan takes probably about 20-30 seconds. But I usually scan at 300 for the master, and then just re-dimension the jpgs. Gives it a smoother look. 300 dpi, I'd say probably about a minute, or a little more. USB-2 connections are faster, but for speed, find a model that has a firewire connection (as long as your computer also has one, although you can always add a firewire card).
A few years ago, someone was selling a bunch of big-scanbed pieces, but I could't afford it at the time. They were called "industrial beds", I believe. Perhaps something oversized comes up on ebay every so often. Don't know. Got enough active searches!
