Toro now makes a mower specifically for the OP's needs. It is called the Toro Timemaster.
http://www.toro.com/en-us/Homeowner/Mowers/Walk-Power-Mowers/Pages/Series.aspx?sid=Timemaster
It is the "Personal Pace" like the one above, but it is a 30" deck. With a 30" deck, you would cut 40" more per swipe over a 21" deck. Not a bad time savings.
Check out the vid.
http://www.youtube.com/watch?v=TJEQ1EYyo0w
At first, you think its a normal home walk-behind mower. But at 0:13 in the vid, you are like "Whoa....thats a wide mower!!"
Not cheap, about $999 at Home Depot.
FJ
Nice find. Too bad it's three times the price of my regular Toro Personal Pace.