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Planetary imaging requires excellent seeing primarily. Also a power barlow from Televue and F40 or so. I have only done a bit using an 11 inch Celstron SCT and it was fun and I got OK results. Nothing spectacular.
I would go for the GSO myself. As you point out the savings are enormous and the optics seem to be quite good. As you say a nice new Feathertouch or Moonlite focuser and you have something quite nice.
Depending on your budget the 10 inch truss or the 12 inch truss would be the way to go if your mount can handle it. Solid tube might be ok up to 10 inches but really a truss leaves a tube for dead. Thermal currents in a tube are going to cause some difficulties.
2.5 metre focal length on an inaccurate mount could be a challenge though.
Greg.
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