well, the 17" is very large and heavy. If you going to be carrying it around all day I would buy the 15" maybe even the 12" and just buy an external screen with the extra money. the 12"= 4.6 pounds, 15" 5.6 pounds, 17"= 7 pounds
although the 17" is the thinnest one I think it is easiar to flex. and ram is upgradeable to 2gb on the 15, and 17"
hope that helps.
-mitch
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