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The Astrodon MOAG is far and away the best one available... The Taurus Tracker III is also a great choice... I've used the Celestron radial guider, and its not a bad cheaper option, the Lumicon Newtonian easy guider is another great cheaper option...
I also hear the new Orion deluxe OAG is a great bit of gear... there have been a few sold with some manufacturing issues, but on the whole, they are seen to be a great budget option at $209 AUD from bintel...
Rigidity is the key with the OAG. Theres no point getting rid of the differential flexture of your guide setup if you're introducing more flexture with an OAG... The more money you spend, the better off you'll be.
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