Each calibration widget and associated software has its plus' and minus'. For doing dual monitor calibration, which seems to be what you need, make sure the particular calibrator/software you buy supports this feature - they don't all support dual monitor. I use a Huey Pro for my laptop which usually has a 2nd monitor plugged into it when used on a desk. The Huey Pro does dual, the basic Huey doesn't. I'm sure other brands will do a model for two monitors, but check first.
Regardless of which widget you buy, if the two monitors use very different technology, you may find that they will never look quite the same as each other even after calibration. My stand alone monitor is a panel that uses MVA technology, my laptop is a TN panel, even after cal, the black and white points are quite different, the technical limitations of one panel cannot match the other.
Calibrating your screen is essential IMHO, you may be quite surprised by how much difference it makes.
Duncan
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