Metro works great...
For a small business, if you have mostly flat yards, the Ex-Mark Metro works great. I've used one for three years, and they also handle well on slopes. I did purchase a Jungle Jim attachment which helps save on walking so much. The Ex-Marks are built to handle the commercial stress and strain. Although I am thinking of adding the Gravely 36X to my toolbox. It's a smaller rider that's also built to take the abuse.
Dan's Lawn Care
Ford F150 XL Truck
6 x 10 Trailrite Trailer w/ramp
ExMark Phazer 34" laser 2006 mower
Big Dog C142 2011 mower
Wright Grass Gobbler
RedMax BCZ2401S Trimmer
Stihl FS-55-T Trimmer
Husqvarna 570BTS Backpack blower
Husqvarna 445 Chain Saw
Redmax HB280 hand held blower
Echo HC-150 gas hedge trimmer
Arien's dual stage 625E snowthrower