Honda push mowers
I have two of the top of the line Honda residential mowers with BBC. I used them for one year commercially and they performed flawlessly. They did start smoking more than I like after a full year of constant use. There are others on here that have used them too, with varying degrees of success. I let them languish for a year and just got them running again and will probably sell them in the spring. Basically, if you don't use them very much, they should last a long time.
After using them, and then giving up most of my smaller lawns, I bought a John Deere JS36 with a B&S engine (6.75) and it was about $300 less than the Honda and the parts cost less and are more readily available in my area and it does just as good a job for less. For limited use, I like the B&S engine on a simple mower and it should last pretty much forever.
2009 Nissan Titan pullling a 18 ft PJ Trailer
2011 Kubota ZD326S (60") - 26HP Kubota Diesel
2010 Bob-Cat FastCat Pro 48" w/Accelerator (20HP Kawa)
Non-commercial 21" walk-behind
Blowers (Stihl BG85/Husqvarna 170BT)
Trimmers (Stihl KM110 & FS90, Kawa Multi-Tool)
Chainsaws (Stihl MS180 & MS362 w/20 & 24" bars)
& misc hand tools & equipment