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I don't think going from 10" dob to 5" mak is going to change seeing the moons of Jupiter as dots or Saturn rings bigger-infact unless you are buying a instrument with quality optics (eg intes micro) you may be disappointed. At the least you'd be looking for 6" refractor or c9.25 for eg.
Having compared the 2 scopes at old Melbourne observatory I'd take the 8" refractor over the 12" reflector any day for planetary work, it is crisp- the Brandon eyepieces don't hurt (not a big fan of the claves on the 12")
I suggest you find someone nearby Newcastle with a 5-6" cassegrain scope & look for yourself
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