Thanks for the feedback!
Ultimately it was fate that decided for me. I wanted something that would fit in my 4ft wide trailer and through 48" gates. I found a 44" Bercomac deluxe from a Craftsman application that was in great shape for nearly free, and it came with V bar tire chains too. I made a subframe with a jackshaft that copied the OEM Steiner design, and got the impeller speeds figured out. In doing some research, I figured out that the late model Steiner blowers are all made by Berco anyway, and that the 48" model is just a 44 with widening plates on it. The subframe is a little heavier duty than it needs to be, but it worked out well and I got it mounted a few nights ago. Chute rotation is a hand crank, but I will probably upgrade to hydro eventually.
So far, it's great. Berco makes a good blower. This one is built like a HD blower, with a chain driven auger and direct drive fan. It's still lightweight enough that it's easy to attach and remove. Way quicker around buildings etc, and less fear of banging into something. The Onan seems to have good power and the blower seems well built and is reasonably lightweight - The tractor seems to handle the weight very well. We haven't gotten much snow yet, but now I am really looking forward to the first dumping.