Pretty much what everyone has said.
Toro and Exmark make great hydro walk behinds and have a lot of dealers around. I honesty like the Toro a little bit more for the controls and over strength of the machine. I would also recommended the Gravely Pro Walk, which is the same as the newer John Deere mowers just different paint. I got the 48 inch after demoing it and the Exmark and Hustler. It is very easy to get use to and cuts great. I plan on getting the 36 inch model and maybe the 52 Pro walk or Pro Stance in the future too.
2006 Ford F150
2013 Exmark Turf Tracer S Series 48
2013 Exmark Commercial 21 X Series Kawasaki BBC
2012 Exmark Commercial 21 S Series
2013 Echo PAS-280
2013 Echo PB-770T