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Ask about getting a Telrad, invaluable. Think about asking about getting Bob's knobs for both the primary and secondary mirrors. The set for the primary has stronger springs and the sets for both mirrors can be adjusted without tools, you will want to be able to do this eventually, so why not do it from the word go. If you are not confident swapping the collimation screws over yourself it may be worth asking if they will do it before delivery. I used one of those 12 inch dobs for a few years - with a great deal of pleasure, they are great out of the box but after a while I found myself thinking "what would make life a lot easier is...." Also ask if you can have a go at taking the OTA off the display model and lifting the OTA and base around the store, that will give you a good idea of how far you want to be moving the telescope and where would be a good place to store it.
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