Thanks to you all for your comments. It certainly helps to have a forum in these cases, and this seems like a good one
I'm pretty solid on the 12" now, which was my original choice anyway. The size and weight is not a big deal as I'm strong and live in an aircraft hangar. Seriously though I will likely only use it at home and I'll just make a roller base for it if it's too heavy. After reading the collimation threads my choice is most likely going to be the Orion pair. Thanks again!