You get a 100gb HD an increase of 20 + 2" more screen real estate and a slightly heavier load to carry round.
For small group presentations a 17" is big enough to satisfy most peeps - the 15" is just a bit too small w/o a second display.
If you need it now then the 17 is way to go - the BTO on the 15" will prolly take a while.
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