Andrew, I highly recommend a purchase from Bintel as they can provide you with all of the support you need. They check collimation etc before you walk away with the scope, and all of the salestaff are experienced amateur astronomers, so their after sales support will be excellent. Having a physical store you can visit has its advantages over an internet based virtual store.
The value of the collapsable style dob is in the transportation of it. If you are mainly observing from home etc, then this is less of an important feature. Indeed, sometimes the collapsable style can create stability issues if the poles are not tightly in place. I would have thought in your circumstances a solid tube would be preferable. Again, however, I repeat, TRY BEFORE YOU BUY!!!
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