G'day harway7.
I went throught the same thought proccess you are going with.
I went for the 12" gso dob instead of the orion scope for a few reason.
1 I was told that the control set up was more northern skys, but could be made to work here in OZ.
2 Warranty, From what i have read Orion do not sell from there website out of the USA & Cananda So there could be a long delay if anything goes wrong with the scope to get warranty done.
3 I thought the argonarvis would be better on the gso that what Orion offer on there scope.
And when it comes to outside temp i have had my scope out in -3 with no problem at all and i must say the Lagoon looked well
Hope this helps you a little bit when you make ur mind up and I guess get what your happy with.