I'm also in upstate NY, with similar driveway and mowing requirements. I've plowed with a tractor, and with a truck, but 23 years ago switched to a 7' rear mounted snow blower on a 40hp tractor. I'll never go back to a plow. I'm mowing with a 60" Kubota ztr. I could switch to a 72" belly mower or a rear finish mower, but the 40 hp tractor is too big/heavy for the lawn and too slow.
The nice thing with a blower, you have no snow banks and you only move the snow once. It doesn't care if there is 3" or 3', one and done, with a plow you need to keep after it, 12" of wet snow or 18" of powder is a lot to plow.