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Well what exactly are you wanting to pay for? If your looking for a good large aperture dobsonian there are many choices to 20" available commercially, built using more modern strut designs, easily transportable, and importantly - have realistic resale value. I would stick with a scope that is no more than 20", simply for ease of transport and resale market size - and eventually you will sell it. The problem i see with SDMs and Obsessions, and their ilk, is that the market is extremely small if you decide to sell. Whereas a large Skywatcher, or GSO, or other Dob, can usually be pretty easy to sell.
Sure the owners of these ultra expensive scopes will dabbled in about attention to detail, finish quality, and all sorts or things used to justify jacking up the price, but none of that has much to do with what sort of performance it turns in when your looking through it. Mirrors are easily upgraded if you want to spend more than the very good offerings through the mass market retailers. That's my 2 cents. I am sure my opinion will be ripped to shreds, as usual, but it's your money, don't be fooled by marketing spin.
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