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Hi Hans,
Firstly, I've never used an ADC ...
Visually, I've never found dispersion to be much of an issue, providing you wait until near the "high point" of the evening - even on humid nights it only seemed to affect me in the lower 20-25 deg or so. Even with colour imaging, it wasn't toooo bad - Registax's RGB Align feature worked OK for me on the occasions I needed it. Your experience may be different of course, but I personally wouldn't rate the deficiency of dispersion at 350 Euros' worth for the average viewer.
For imaging, it may be more cost-effective, and indeed may produce better results altogether, to use a mono camera and RGB filters, and you'll also have the opportunity to focus each colour optimally. Theoretically, dispersion will also occur in mono/RGB-filtered imaging and an ADC should sharpen single colours as well, due to the "broadband" RGB filters used - and they're necessary to grab enough light for the short exposures we use in planetary imaging. But, I've personally never noticed a dispersion problem in mono/RGB. Then again, perhaps I've not imaged at high-enough resolution to encounter the problem.
2c.
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