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Hi Lookus,
I started the other way around but a 6" f/5 newton and I can tell that in terms of the wow effect the ed80 has it.
The newton suffers a bit from its short focal lenght. In images you can see when its miscollimated and you get vignetting and curved edges on my 450D.
For newton speaks the bigger apperture, no question. And with faint objects, you want focal lenght (as they are small) and apperture to hold the shot as short as possible.
Imagequality wise IŽd say you will find more detail in your images as it gathers a lot more light in time but the colours are not quite the same as with the ed80. I suppose it depends on what you wanted it for.
I was actually thinking of ramping up my omniXLT and cut it off at 580mm and install a larger secondary to overcome the distortion issues but I am a little hesitant as I am soon moving to NZ and came to think that after all it might be cheaper and time saving just to buy.
Let me know how you go!
Cheers
Max
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