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A newtonian will be a better option in the lower price brackets for imaging. Because these cheaper, fast achros are notorious for bad/horrible CA.
The Skywatcher 6" F/8 Achromat isn't too bad... (I had a Saxon version of the same) although, we're talking about a LONG scope.. from the tip of the dew shield to the back of a camera, when focused, you're looking at about 1.4~1.5m..
For the price, you're better off looking to a 8~10" newtonian. and a 80mm F/5 achro for guiding... Refractors are a more simple scope to use day in, day out, they require no collimation, little to no cool down, where as the newtonian will require you at least check the collimation on every use, adjusting as necessary... But if you want to take images, even a cheap newtonian will most likely out perform a "Good" fast/medium Achro refractor.
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