I"m seriously thinking of purchasing a walk-behind next year. I have a 60 inch Gravely and think one might be a good complement to the larger mower. I haven't serviced all that many small yards, but on the couple I do, I think there are times a walk-behind would be more efficient than the big Z. I also have several accounts that have pretty steep areas, most noteably ditches, and from what I read here, the walk-behind is more efficient on steep slopes. I have a 21, but not self-propelled, as I use it very little. I'm thinking a 21 is a bit too small, and time consuming, hence the desire for a bit bigger deck. Here is the deal. I've never had the privilege of operating one, so I bring no previous prejudices or preferences to the table. I'm leaning toward a smaller deck, because smaller areas is likely where I'll use it most. Gates are not an issue at this time, and may never be much of one, as gated backyards are not extremely common here, but it might be nice to be able to fit through one, if the situation arises on future accounts. As for brand, my dealer handles Toro and Gravely mowers, so it would be one of those, if purchasing new. I know some of you would perhaps recommend the Quick line of mowers, but I'm really not interested in purchasing anything that doesn't have local dealer support. Other than that, I'm wide open to suggestions regarding engine size, drive system, controls, etc. If I purchase one, I don't anticipate putting lots of hours on it, so I will likely have it for many years, therefore I want to make the right choice the first time. Okay, so convince me which configuration of drive sytem and controls, in which brand would be my best choice. Thanks.