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I have an ETX 125 and it is great for the moon, planets, double stars, and the brightest DSOs. The earlier tripods with the aluminium legs were flimsy but the ones with the steel tube legs are very solid. Yes, it has plastic gears (the main cog and worm drive are metal) but so do the big SCTs!
Sometimes they have problems (eg. grease on the clutch plates) that are easy to fix if you look on the net. With a focal length of 1900 mm the field of view is a little narrow for wide field viewing (got some binos?).
If you are into Deep Sky observing then I would recommend 8 inches plus (my 10 inch truss dob takes up less room in the car than the ETX in it's case plus tripod). But, the difference in going from the ETX 90 would be noticeable. I noticed a substanial difference on all objects in going from a 16" to a 22" scope recently, which is about double the light collection.
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