I have a 52" Keese zero degree hydro walk behind with a stand on sulky. They dont make them anymore, but i would deffinately recomend a walk behind with an out front mower. With an out front mower you can get under things that you would not think about if you were sitting on top. If you get something newer with a 50" plus cut be sure it has 18HP minimum. I also highly recomend discarding the standard blades and multching kit and get Gator blades. You can go over knee deep grass and it will cut it up into small bits without loading down the engine. They will even handle wet grass.

__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes