I have a 1+ acre lot which is largely open and poker flat. How much mower do I really need to keep it nice? Price isn't really an issue although I would like to avoid buying more than is necessary. I'm torn between buying a higher-end residential mower (Toro TimeCutter MX5060 or Gravely ZT XL) or an entry-level commercial model (Ferris IS600Z or Exmark Pioneer "E" Series). On the other hand, should I consider some kind of riding mower (Cub Cadet GTX 2000 or John Deere X320) that could also be used to move snow? My driveway is only about 100' long, but I am starting to get up in years and sometimes have back problems. Please offer your thoughts and recommendations.