For basic scanning and editing work, I'd really look at an iMac.
They have a few things going for them. 1) Small desktop space, small power requirements, and low noise. (Although this might just be my pet peave.) 2) Decently fast. In everyday work, it's not going to be a 3 GHz Pentium 4, but photoshop can take advantage of altavec for a lot of stuff which brings image editing up to speed. (for example my 400 MHz G4 laptop lets me work about as fast as my 2200 Athlon XP for imaging work) 3) Decently priced... around $1800 for a 17 inch screen and a DVD burner. 4) And then there are all the advantages of MacOS X. I won't try to preach too much, but my laptop has crashed twice in the 2 or so years that I've been using OS X, I've never gotten a virus, and the built in spam filter works pretty well.
Of course, if I had the money, I'd immediately get a G5. The real problem is that my laptop still does everything I need it to do with speed that puts other 3 year-old machines to shame.
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