Quote - randym77:

these monitor calibration instruments are colorimiters and are basically all the same. A pricier one might be a tiny bit more accurate, but 99% of the added value is in the drivers and software. A less expensive solution will be OK, just check that it has support for your OS and that you won't miss extra features, faster operation, simpler interface etc. Ideally it should generate ICC v4 profiles, but v2 will be perfectly OK. If you want super-accuracy you need a spectrophotometer, like this.

 

Actually, reading the reviews at Amazon, it sounds like paying more gets you a less simple interface.  The cheaper versions have you choose options from a dropdown, while the top of the line lets you create your own profiles and customize everything.

Not sure whether that's worth it.  More control is good, but I'm basically lazy, so I might not actually use all that.