I like my X-Rite Eye-One Display 2. If you're not looking to spend $200, then you might look at Spyder or Pantone's Huey Pro. The nice thing is that you should never have to upgrade or replace the calibrator to get more gigahertz or megapixels... it just works.
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http://www.polycount.com/forum/showthread.php?t=65367
i'm using the pantone huey pro. works nice but could be better IMO.