i have 3 acres to mow(personal property). the land is kinda rough near the back of the property. but it is fairly smooth in the front. the last 3 years i put 220 hrs on a 50" cub cadet(big box special). i am looking for a mower that will last a very long time. i am a aircraft engine mechanic so i know my way around tools. what are some of the minimum level of transmission, engine sizes and deck thickness to consider?