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Dave, if you want to see DSOs you need really dark skies and lots of aperture. You can't be a big Newt for bang per buck. Visual very different to imaging them mind you. For planetary, you need aperture and focal length. A big dob is again hard to beat, but a decent SCT definitely in the running but lot more expensive than a newt usually.
I'd suggest you'd be better off with a single 10 or 12" GOTO (tracking) dobsonian for what you describe.
What you really need to decide is why you want an equatorial mount. For planetary imaging you don't really need it, but anything requiring individual exposures >30 secs you're better off going equatorial.
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