Sorry, I don't know what you mean by sulky. That might make more sense if I did, but walk behind and two and a half acres doesn't seem to make sense to me. I don't feel like I know enough about used mowers to go that route. My last two crappy mowers have been hand me downs (one from craigslist that my wife blew up, and the other from a 'friend'). I don't doubt your advice and maybe that's what I'll end up doing, but it's completely opposite from all of the other advice I've received in the forums trying to pick out a mower.