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
Exmark Lazer Z X Series
Exmark Turf Tracer S Series 48 (x 3)
Toro and Exmark Push Mowers
Stihl and Echo Handhelds