Its not impedance, its sensitivity you want to pay attention to. And its not watts, its the amplifier. Sorry if that sounds vague but with tube amps its more the design and especially the transformers than the watts. Hard to believe until you hear a couple 50 watt tube amps play louder and with better bass than 200 watt ss amps. Do this enough times you start to realize watts are one of the most meaningless specs around.
I'm not gonna do your work for you. If your speakers are around 90dB or higher the PL will have them singing. Raven Blackhawk even more so but that's your choice. If they are in the 80's, the lower into the 80's you go the harder it gets to find anything that will drive them. The higher into the 90's the easier. That is why sensitivity is the single most important speaker spec.
I'm not gonna do your work for you. If your speakers are around 90dB or higher the PL will have them singing. Raven Blackhawk even more so but that's your choice. If they are in the 80's, the lower into the 80's you go the harder it gets to find anything that will drive them. The higher into the 90's the easier. That is why sensitivity is the single most important speaker spec.