I think Sam hit the nail on the head. HP is not an issue with the older tractors. My two cents are you will be throwing money out the door buying an ATV if you won't use it for more than removing snow.
As for your "new" tractor, keep it as a grass cutter, not a snow removal machine.
IF you purchase an older tractor you'll have something you could get attachments for down the road, and who knows you might like it enough to use it as your grass cutter.
Where about are you in WI?
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