Those 3 units you have are pretty close to each other in specs,features, but umm, you must take into consideration your speakers sensitivity, source, room acoustics will and do affect the sound quality. If your speakers are very sensitive like 90+ and up you shouldn't need a ton of power for them to play loud.
unlike speakers with low sensitivity like 88 or so, 4 ohms speakers need more power to drive as opposed to 8 ohm speakers. But that's a nice dilemma you have in my book trying out 3 units can be lots of fun.