I strongly suspect that the difference between makes of colour calibrators is a question of interface and personal preference - colorimeter technology is pretty simple and old. All they are all doing is measuring the luminance and chroma that the software displays on the screen, guiding you through the colour adjustments on the monitor and deriving a profile with the adjusted settings to "set" the monitor's colours at a given gamma and temperature. I have a Spyder2 (suite edoition) and for my purposes it is more than sufficient. Had I payed almost twice the price at the time, I would have gotten the ability to make custom targets, have multiple monitor support, front projection calibration and a few other features I didn't need.
So what it boils down to, I believe, is that you pay for a lot of features and/or the brand's reputation. My advice is to choose the most inexpensive one that has the features you need, and, if you can, test before buying just to see if the interface is straightforward and easy to follow and understand.
And I strongly recommend (assuming your monitor is decent enough from the getgo) buying the colour calibrator BEFORE a new monitor. The best monitor in the world will produce crap images if not properly calibrated. A colorimeter is an essential part of a decent workflow, IMHO.
Good Luck!
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