Help me:510m or 6000

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I have to make a choiche between 510m and 6000.

Price it's about the same (1Gig RAM,60GB/5400rpm)
but on the 6000 there is a dedicated video card.

I'm not interested about 3d and gaming, but I was wondering
which one is lighter and smaller; 6000 seems to be huge
while the 510m smaller.

But the quality is the same?

Thanks in advance