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Hi SAB,
This is a difficult decision and really you are the only one who can answer it.
I currently have 3 scopes. An 18" Obsession, a 14" SDM and a 10" GSO tube dob. Both of the larger scopes have Argo Navis and Servocat fitted. I wouldn't be without it on those two larger scopes. The 10" GSO only has Argo navis on it. As Gary previously mentioned motorised tracking adds 10% to the scopes aperture IMO.
Peter is currently building me a 10"/F5.3 baby truss dob, which will be my travel light, travel scope, to replace the 10" GSO, which doesn't travel so light. The 10" truss scope will have a premium everything on it, including Argo Navis, Mark Suchting mirror, Feathertouch focuser, Protostar heated quartz secondary etc etc. When it is finished it will cost me well over $4,000, which is a lot of money for a 10" newtonian. As much as I wanted to, I couldn't justify spending another $2,500 or so and fitting Servocat to it. Particularly, considering this will easily be my least used scope. However, if "cost was no object", it would be on there in a heartbeat.
Cheers,
John B
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