I'm a 900 owner. One reason I bought it was for the better PDF support. What I found is that it's still not enough of a solution - too much scrolling involved in landscape mode, and portrait mode text is usually (but not always) too small. I thought I could read technical papers on it with equations, but I think there's no substitute for a bigger screen.
All that being said - I do like the 900, and the 3-G (which I didn't think I'd use) is nice to get the paper. Thus I would still stick with the 900.
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