Not much to add except that I have been using the Peavey IPA300T almost exclusively in large paging systems with good results. I've installed dozens of them and have never had a failure.
Single Channel, 300Watts, Transformer isolated output, "Speaker protection System Circuitry" (Whatever that means
)In addition to 70V output, has 25V output (Some municipalities consider a 70V paging system "High Voltage" and require the wiring to be in conduit. A 25 volt system allows for running wire "free air.")
Nothing wrong with the other amps mentioned, I wouldn't hesitate to use any of them.
I guess the only other thing I would Suggest is, if you are planning on doing more of this kind of work, get an impedance meter. (Gold Line ZM-1 or TOA ZM104 are two common models.) Once you have one, you'll wonder how you ever got by without one!