I have a new Iiyama 22'' that has DVI and VGA connectors. Using version of Panorama installed by eCS 2.0 RC4, if I use the VGA connector all the resolutions from atombios are available, including 1600x1050. If I use the DVI connector, there are just 4 basic resolutions, from 640x480 to 1280x1024.
I'm currently using VGA connection, but I would be happy to use DVI instead!
With Snap, both DVI and VGA give the same resolutions choice.