Ben's right, either will work for you. It's going to come down to money and features. If the 700 doesn't have all the features you want and the 900 does, then there's your answer. There's no reason to go top of the line of you won't use all the features.
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more fun than a well oiled midget
The best argument against democracy is a five-minute conversation with the average voter." - Winston Churchill
i say somethin' stupid everyday, nothin' new

- Flattop