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Hi Suzy, I've been debating the 8" - 10" decision as well but I'm upgrading from only a 4.5". I am also building my own truss dob using only two poles ( according to current plans which may change ). From my point of view the build is only 50 mm bigger in the cell size but the same length as a 8" f6. It is also slightly dearer for the mirror but the deciding factor was the light grasp of the 10" over the 8". It goes from 841 to 1317, a significant factor. My 4.5" is 265 so I'm expecting to see a big change. Light grasp on a 6" is 472 btw.
I'm adding fan temperature control to the primary and heater to the secondary, we get the heavy dew here as well.
I'll investgate shrouding if it proves necessary but I have access to a good dark site.
Good luck with your choice but aperture rules as they say.
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