Cub Cadet residential machines would be some to avoid in my opinion. Besides the engine, and I would suggest Kawasaki VS the Kohler in this price point you should consider what wheel motors it has. Cub Cadet and most of the low end residential models have the non serviceable ZT2200 hydro motors that are fairly weak. Look for a model with at least the ZT2800 units, those are serviceable and much stronger than the 2200's. Also the deck is a huge consideration and cub cadet doesn't have the mest deck design for speed and cut quality. Exmark, Ariens, Gravely, Toro, Scag, Ferris ect are all solid manufacturers to consider depending on local dealer support.