Hi Tarn,
Id agree everyone here with the 6" and the HEQ5. Its exactly what I use and it has served me well with my trusty Canon 450D.
A coma corrector is a must unless you like cropping all the edges off your images.
I use a guider now but with good polar alignment you can take 90 second to two minute subs and then stack.
Here's a few unguided images I took a while ago.
Cheers
Andy
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