950 is a fine model, especially if you read a lot of PDFs and need the screen real estate.
650 and 350 are definitely more portable... size format wise
As for 3g and wifi... well.. take it or leave it.. as long as I have handy access to the dictionary (which doesn't require wifi or 3g) I am okay.. as I rarely need it.
Side loading of books and impulse buying are other quirks.. but YMMV..
I believe the older 900 had a removeable battery vs the 600/650 and 300/350 do not offer that.
Larger screen is nice.. if you don't mind carrying it around!
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