Also consider the Vixen Sphinx Deluxe - which has carrying capacity (15 Kgs) like a GM-8, excellent pointing, tracking and PEC, but costs around $2,500 vs the $4,000 for the GM-8 plus Gemini.
Wait for more replies too before you decide.
Critical questions you need to ask include:
1) how heavy a load do you wish to use - this affects you choice of mounts.
2) how longer images due you wish to take - a rig that can handle a heavy load for a 20 minute shot is alot more demanding than a righ that handles a modest load for 5 minutes. What parameters will you operate within?
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