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The GM8 is fine with a 120mm refractor for visual use unless it's windy. A G11 would of course be better, and if you are entertaining anything bigger it's really not a choice, you need the G11. The GM8 tripod is extremely well made, very solid - all the movement is in the head - even with the legs are full extension.
The biggest consideration for us was weight and moving it around (living in central Melbourne we travel with our scopes alot) - A G11 setup is twice as heavy as a GM8 - every part is double, tripod and head. skyoyster is happy setting up the GM8 solo, lifting a G11 16.5kg head up onto a tripod would be too much.
I second the advice about the Argo Navis - for a portable setup it's very quick and easy, you just push the scope around - use the argo to find things and the motor for tracking and fine tuning. Nobody really knows how good the new Gemini V5 is going to be though.
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