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doesnt sound like a bad idea....
The for a lunar/planetary/close up DSO scope, a ED120 is not at all what I'd look at... I'd be looking towards a newtonian or a SCT.. I would (and did) get a small/cheap 80mm achromatic refractor as a guide scope, and then move swap between the ED80 and a much larger aperture scope for planetary...
For planetary imaging, light gathering power is THE most important factor... Focal length is also a big one...
a 10" Newtonian reflector is a great way to have a mixture between size and portablility... a 10"~12" SCT is better again, but at a much greater cost...
As for the camera - the best you can save for is always a good plan... there is no set rules, however, if you can save for a Canon 40D/450D you'll get live preview, live preview can be very helpful during focusing...
Mount : An Orion EQ-G and a Skywatcher EQ-6 Pro are exactly the same thing.... and quite suitable for the task at hand, its very easy to set up and use, and also very portable..
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