The 600 is the one we got for him. Glad your mom likes hers, Jon. The UI seemed by far the simplest of the lot. And since it's nearly identical to my 700's, that'll make the inevitable Tech Support calls from Puerto Rico easier to talk through.
The decision needed to be made this week, which ruled out waiting for Kindles to appear in stores sometime this year.
Besides, I'm more adept, so to speak, at liberating epub files from handcuffs than Amazon files.