What is the difference between the 100 and 200, they both have the same lumens and contrast.
From PC Review of the AX200::
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The AX200U incorporates several improvements over the AX100U. One more HDMI input has been added to the connection panel, so the AX200 has two HDMI inputs in addition to the complement of traditional VGA, component, S-video, and composite video jacks. The auto iris has been redesigned for longer life and faster action. And the Light Harmonizer has been improved, and is being promoted as the Light Harmonizer 2. In the AX100, the Light Harmonizer adjusted gamma to compensate for changing ambient light conditions. In this system, not only is gamma adjusted when ambient light conditions change, but lamp output and sharpness settings are automatically adjusted as well.
In addition, the AX200 has a preprogrammed Game Mode, which adjusts gamma and brightness to open up shadow details in video games that would otherwise be too dark. So with the AX200U, it is easy to switch back and forth from the Cinema to Game Modes based on the material you are watching, without having to go into the menus to do brightness and gamma recalibrations. An additional feature of Game Mode is that it reduces buffer time to give the gamer an almost instantaneous video image and thus better control.
The price of 100 was $1999 when it first came out, the 200 is $1299.