17" is gonna be able to offer more performance if you want it because it can house more... 15.4 is the sort of mid-way point as far as cost/performance to portability/battery... I dont know much about smaller laptops but they seem to work better for school and jobs where you travel alot or are in need of a basic machine on the go... any ultraportable with good performance will cost through the roof(relative to a larger 15.4/17" notebook)....
Muller
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