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Ok,
So lets say you keep the mount (which can carry about 22kgs and its tracking is about +/- 15-20 arc seconds per worm revolution untuned) - so maybe up to a 10" OTA plus imaging gear and dovetails.
The cameras you mentioned are okay for that size scope but not brilliant (that's I guess a different price category as you get into purpose built astro cameras API, FLI, S-Big).
Lets also assume you have or soon will have good to great electronic, computerised focusers (TCF, Moonlight etc) to take that issue out of the equation.
So that leaves us strictly with OTAs under say 14kgs. Planets you can image are pretty bright - so a good APO will grab these, and the APO's from 4" -> 6" will give excellent shots of wide field targets.
Now you haven't let us known how dark your skies are - so if its like mine (11 km from Sydney) then the Helix Nebulae - even with Hutech LPS filters - is out of my reach due to light pollution. If your skies are dark then a large APO should be appealing. The ones folk are getting from China North group seem very interesting and a fraction of the Televue or Tak ortho-apo's costs.
If your targets are very small and dim - I don't imagine you'll succeed unless you have very dark skies and an excellent, 5" or larger apo?
Like Geoff asked - interested in what limits you on the 10" you have at present.
Even more detail on the fov and focal length you aspire too will narrow advice. If you say < 1 arc minute targets that are 14th magnitude or fainter - well that's a large RC on a Paramount's terrority. DSO's is too broad a field to offer more specific advice. Why not browse thru the DSO images on this forum and list the sorts of targets you'd like to shoot?
Basically the fainter the targets you are after - the more higher end OTA we have to recommend. But regardless if your targets aren't discernibly brighter than your background sky glow, you're in for frustration.
Also do you want grab and go - or can it be permanently mounted? Is your imaging location sheltered from wind - a EQ6 is going to struggle with a 6" refractor in moderate wind!
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