I've been thinking about my next camera purchase too, Doug, but Theo is right - there's still a huge learning curve with the basics of DSO imaging and image processing, before spending several thousand dollars on a new DSO imaging camera.
I wouldn't recommend the DMK4x as a DSO camera.. yes, it can do it with up to 60min exposures, but it's not designed for that. You'll get a much better result with the 350D. If you want to stick with a DSLR, get it modified and increase the h-a and red sensitivity.
Spend time learning the craft with your 350D, which is a more than capable DSO imaging device, and in the meantime, save your pennies for a ST2000XCM or a cooled, modded 400D or something.
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