New Kenwood Amp for 2012 Prius

Hi everyone! Back in March, I upgraded my head unite to a Kenwood DMX957XR, and it is amazing! I'm beginning to look into replacing the rest of the sound system, and looking at amps. Since the Kenwood head unit is so good, I'm considering the Kenwood XR600-6DSP. I just have a few questions (sorry, I'm not much of a car guy):
-Would that draw too much power from the battery? It's 100W x 6 channels
-If it works, is it any good? Not looking for loud volume, but clarity
-What do I need to connect it to my head unit?
-If this works, are Kenwood's eXcelon Reference speakers good? If so, which?

FWIW, I have a 2012 Prius, originally had factory navigation but not JBL. Running an iDatalink Maestro RR2 for steering wheel retention. I'd like to replace the front and back door speakers, the tweeters, and maybe a sub. Again, not looking for loudness, more sound clarity & quality. I usually listen to general music. Not a fan of rap, hip hop, and only a hint of metal. Most music is pop, jazz, R&B, plus a bit of NPR and audiobooks.

Thanks in advance for any and all advice!