Ya know, I used to be able to answer questions like that, but since I switched back to Mac, I haven't been keeping up on the Windows systems, except that I don't even vid on laptop. I vid on the desktop. That's mainly because FCP just goes "NOMNOMNOM" on the memory.
If you're just going to take it on one trip, size shouldn't matter that much. It's when you have to lug it around ALL THE TIME that it gets really annoying if it's too big. The occasional trip should be ok even if it's a bigger laptop since most of the time you'll be using it at home. If you just get a smaller one because of 1 or 2 weeks you have to travel with it, while you spend 1-2 years or more using it at home, well, that just doesn't make sense.
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If you're just going to take it on one trip, size shouldn't matter that much. It's when you have to lug it around ALL THE TIME that it gets really annoying if it's too big. The occasional trip should be ok even if it's a bigger laptop since most of the time you'll be using it at home. If you just get a smaller one because of 1 or 2 weeks you have to travel with it, while you spend 1-2 years or more using it at home, well, that just doesn't make sense.
Hope all of THAT made sense.