I would suggest that you also look at the specifications for some commercial PA's. Consider that they will be formatted to show the amplifiers in their best light while often down-playing (hiding!) weaknesses. Look at both what they do say and where they are mute.
You might also want to add things to your list of specifications that include cost, size power consumption, voltages and current drain needed, heat dissipated, heat sink requirements, materials used, and so on. The idea is to include things that might be important in your application that may not be the usual RF like parameters.