Stay away from ADF Airways. I got my PPL there. They'll push you to do many many hours before you go on your checkride. They had to many students back then (2004). Some of the aircraft were good but some of the others were crappy. They usually bumped you out of certain airplanes to give it to other customers. Bad practices.
Dean International, they have a good Arrow and Skylane. Don't know for the rest of airplanes which I know is a lot of them. However, the Administration is not good. Instructors will have you waiting, to pay for the rent you will stand in a small room and wait and wait to be attended. Person running the payments has no clue of what an airplane is.
Don't know about Silver Express. Seen their airplanes and didn't like them.
As said before, find a good school with good and well maintained aircraft. Find an experienced, knowledgeable and helpful instructor. Take your time to shop around. This is important!
Good Luck!