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I believe the ETX 105 is reputed to be the best engineered of the ETX series. The tripod is much better and allows polar alignment, both gears arent plastic-I think one gear is still plastic though.
Having said that the ETX 90 I read somewhere is the largest selling scope
If you really want to know everything there is to know about the ETX line there is no better place than Mike Weasner's site
http://www.weasner.com/etx/menu.html
( I did this as a quick reply so you may have to copy and past the link)
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