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I'll echo what was said below. Your limiting factor is the mount, so I couldn't recommend an SCT. First, the mount would handle the shorter focal length of the newt better. Secondly, that focal length would be a better start for DSOs (800 - 1000mm, or even shorter).
Martin below gets really nice stuff with his 6" F5. Or an 8" F5 or even an F4 if you are prepared to battle with collimation more. You will need to factor in a coma corrector - I have a Baader MkIII which I like (bought from TS Express - much cheaper than buying locally), but there's a range of opinions on what's best.
Have you considered a 4" APO ? The HEQ5 would handle it much better, plus no collimation, no coma corrector (although would need a field flattener). And way more portable !!
My disclosure - I use a 4" APO and an 8" F5 newt - and like both for different reasons. The newt is nice and fast with better resolving power, but the APO is much easier to use
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