Depends on what the output is going to be. If you only are going to do scans for yourself and not for advanced printing in 6 colors and 200 lpi, then I guess you could get away with even a simple scanner like the Canon's. Just remember: the more pixles (for instance 2400x4800) the better and also the higher number of the bit depth, the better.
I bought a cheap Canon scanner for home to do some lineart and some photo's and it's been working great. I could have gone for their mid-range scanners, but I thought "nah, I use this until the need rises for more and better". It's light weight and it matches my PowerBook.