I have had great luck with JD LA135 going on about 7 years with nothing but routine maint. I have a similar sized yard as the OP and well manicured grass. These cheapo tractors are great for flat properties under an acre in yards that are cared for. Anything that puts stress on the tranny like plowing, towing heavy loads, hills, etc will destroy these machines. As will running over obstructions like giant rocks, steel, multiple acres, etc. These are 'disposable' tractors. Parts are expensive and the engine is only rated for X amount of use.
I believe to get a solid JD garden tractor you need to spend 5k.