I have the Kubota B2789 3ph blower. It is 51" wide and a touch over 400lbs. Kubota recommends it for tractors from 13 to 26 hp at the PTO, so you could probably get the next size up. It is excellent quality -- thick steel on all components -- twice as thick compared to my front mount blower -- tight tolerances, smooth running. Also, far cheaper than a front mount! The tub is taller and the augers bigger than the front mount for my tractor too.
This past winter was my first season using a rear-mount blower. Previously I have run a JD garden tractor with front mount, and this Kubota with a front mount. (If you want to know why I didn't use the front mount this year, see
this thread.
My only complaint about the blower iteslf is that the structure mounting the chute rotation is too good -- it is encompassing, making it difficult to clean out after use. Any snow or moisture left behind in there can freeze overnight, jamming the chute rotation. Usually a few strategically placed smacks with a hand gets it unstuck, but a couple of times a propane torch was required.
I am not clearing a church parking lot, but I do have a large parking area, sufficient for about 20 cars, and it all needs to go in one corner. So I blow the snow about 150' from the other end, meaning a lot of blowing stuff that already landed in the middle. Yes, the throwing process does make the snow denser, but while my old green garden tractor struggled with the task, for the Kubota it was not a problem. I try not to let the snow get deeper than 6" before I get out there; the HST makes it real easy to adjust the travel speed when the engine starts loading down, and in real heavy wet snow, I take reduce the width of each pass.
I also have a FEL. I used it for 3 things. As the driveway is gravel, I have the blower shoes set to keep it up out of the dirt. Consequently, I used the bucket to scrape the concrete in front of the garage and the asphalt at the main road. If I had the front mount blower on, a rear blade would have sufficed for that task.
I also used a bucket full of snow as a ballast box a few times in some unusual circumstances. Let me set the stage: The first snow hit hard and heavy this past year. The frost was not yet in the ground. I have turf tires. My neighbour relies on his ATV mounted plow. We both live on lakefront property so everything around here is on a slope.
He soon ran out of room, so I volunteered to come push his banks back with the blower. Not a problem backing in and relocating them 40' -- until I tried to pull forward for the next pass. The turf tires started spinning in the loose stuff left by the aforementioned gravel drive shoe setting instead of climbing out of the hole I had just dug. 4wd didn't help. Locking the rear diff didn't help. I pulled the tractor out using the bucket curl (er, well, UNcurl) function with gentle forward pedal applied. (2nd use of FEL). Before the next pass, I grabbed a big bucket of snow from the bank as a counter balance, and that gave me the needed traction -- no further problems. (3rd use of FEL).
Looking backwards for a couple of hours IS a pain in the neck. Literally. To be fair, it did get easier as I got used to it over the winter, but the process required about 1/2 a bottle of extra-strength Tylonol. But chim is correct that you don't need to be fully turned around. I sit somewhat sidesaddle to the starboard side. I found it the most comfortable -- er let me rephrase that: -- the least uncomfortable -- position for operating the HST pedals. Also, my left eye requires a very thick eyeglass lens, so I have a huge blindspot to my left. I'm better to take the darn things off if I have to twist to the left side. I found a spinner knob on the wheel made steering a lot easier when in that position. And remote chute controls are, IMHO, a "must-have" if you have a cab.
My advise to you is practice driving your tractor in reverse at low speed for a session before making any decisions.