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The Saxon scopes have identical specs, and their eyepieces will be fine for your initial use. They will give identical performance once they have achieved ambient temperature.
When I used a collapsible scope like the Saxon it held collimation well, so I don't think that is an issue. Tube currents are usually more of a problem in solid tube scopes, so I am not sure why Atmos indicates the reverse. However, when the scope settles to the ambient temperature there shouldn't be an issue with tube currents anyway.
I agree that you should go locally; it will be a lot easier to get support from the dealer if needed- and I think you will find that shipping costs from Telescopes and Astronomy would be higher than the difference in prices anyway.
So, if you aren't fussed about the size of the scope, why not get the solid tube Saxon from your local dealer, and use the saving over the collapsible scope to buy another eyepiece when you want, or, even better, put it towards an adjustable observing chair! It is so much easier to look at stuff with a scope this size if you are sitting down! (I notice AstroPete has one for $129. Why not ask him if he will do you a deal!)
All the best,
Dean
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