Go 15# and pack yourself bigger lunches! You'll have the legs of an NFL kicker in no time at all.
Seriously, though. I think the weight difference isn't going to be noticed. The that that will make the most difference is what kind of bag you carry it in. But if you are going to get a mac tower anyway, maybe save the money you would spend and get a 12".
It is better to be judged by twelve than to be carried by six.
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