There are a couple of things to consider about snow blowers:
1. The throat size of the blower directly relates to how much PTO power it will consume
2. Whether you are man enough to withstand the blowing snow that will cover you, your face and any other exposed parts of your body which will immediately begin to get very,very cold.
On one, I have a Lucknow 84" 2 stage that I had on my 5030 which will go behind the M9 this year. I thought the 84" would be fine behind the 5030 and it was so long as the snow was powdery and not heavy. Heavy wet snow had to be approached with care and high drifts had to be taken in at least 2 swipes by lifting the 3 point up and then lowering. I don't expect that problem this year as I about doubled my PTO power. My Lucknow has an exposed chain for the auger drive and I have had the blower for 3 seasons and I have never had a rust problem with either the drive chain or the finish on the blower itself. I lube my drive chain with Bel-Ray Chain wax, the same thing I use on my motorcycle chain. The Lucknow don't come with skid shoes so I fabricated some mounts, welded them on and used round adjustable shoes from a Western Snowplow. They are obtainable on the web and are cheap. I have a gravel drive and that necessitated the skid shoes. Without them, the blower, if you weren't careful, would turn into a machine gun and gravel can break windows and puncture siding right now.
If you have an open station tractor, I'd advise against a blower. Get a blade. The blower will cover you and the tractor, especially if you are throwing the snow a long way and it's powdery. A snowmobile suit is mandatory or Carhartts and a full face mask and good warm gloves, and of course, a cup of hot cocoa waiting for you inside. /forums/images/graemlins/smile.gif