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Jeff,
I feel well qualified to answer your question re. choice of dob, having gone from a 10" Bintel (GSO) dob (rigid tube) to a 16" Lightbridge (yes I got aperture hungry).
When talking a 10" I would go for the rigid tube without a doubt, providing you can transport the scope (my 10" tube took up the front passenger seat in my Ford sedan, with the base on the back seat). Of course, I've assumed here you do need to transport. If in doubt go to an astro society field night and check out the size of the 10" dobs.
A 10" tube is not that heavy and I found the collimation pretty good most of the time. I don't know your level of experience but a truss tube needs collimating every time you set up ( I recommend a lazer collimator). Sometimes I even have to reposition the secondary (something easiest done in the daylight). There is no need for a cooling fan on this size, I just allowed about an hour (sometimes running my aircon in the car to cool it down before arriving at my observing site - something sometimes not popular with the odd passenger in the back seat!)
re. finders, I've had a telrad for years - love it.
Regards
Glenn
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