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I agree, an F5 8 inch Newt with a corrector would be better for imaging than an F9 100mm refractor. F9 is quite slow. F5 is a great F ratio to image with. You'll get bright widefield images quickly. You can also barlow to take it to F8 and more zoomed in for visual or galaxy imaging.
8 inches is a decent amount of aperture.
What about the 8 inch GSO RCs? There are plenty of great images coming out of those. They are biggest bang for your imaging buck currently.
Newt images though I agree are often very pleasing and usually have very tight star profiles. F5 is also quite forgiving for tracking so you'll be able to get nice images with moderately accurate tracking.
Greg.
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