like I said in another post, get a Ferris, They have zero turns that have fully independant suspension. mine mows at over 10mph and makes light work of mowing... it also comes with a striping kit, etc.... These mowers will mow any surface and it does not need to be just flat land... it seriously destroys all other mowers that I've ever owned.
as far as snow removal, etc... buy yourself an ATV, get a dump truck for it as well as a snow blade.. IMO mowers are not that good for utility type stuff...