actually, the 7.7 model was interesting, too, but looks like they pulled it.
for those buying from mobile carriers like ATT, VZN, Sprint, etc. how much of a price difference between ones with mobile radio added and just plain wifi? as mentioned by @Major, month-to-month data plan is nice, as i don't need it everyday. just when i travel, which unfortunately is not as often as i'd like anymore.
i might have to post this question in a more general area.