Graphics card for laptop: nVidia, ATI or Intel?

For my work, I'm looking for a laptop with an Intel Core 2 Duo processor. It will be used mainly as a mobile replacement of a desktop system for scientific research (image processing, programming,...). So it's not intended to be used for gaming. (I also want to be able to use the laptop for office and multimedia applications (playing DVD and other videos, pictures,...) at home, but that is not the primary task.)

Most of the laptops I found, have one of these graphics cards:

Intel GMA 950
nVidia GeForce Go 7300/7600
ATI Mobility Radeon X1300/X1400/X1600

Dell also offers an nVidia Quadro NVS 110M/120M card, but I don't know anything about the (dis)advantages of this type of graphics cards.

How do they perform, compared to each other? And how is there linux support?
.

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