The electron 19 and the Mitsubishi 19 are both very good moniters (in fact, the LaCie uses the same Mitsubishi tube). I also happen to like the 17" studio display (the new one). I actually think $500 is kinda justified for that moniter now due to the Apple Display Connector, USB hub calibration, and completely flat screen.
You really can't go wrong with any of your choices. If you want a bigger canvas, go with the 19's.
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Eliott Wolfe
Winnetka, Calif