Thanks much,
The Sonus Faber Lumina V are rated 4 ohm, but the Polk center speaker is rated 8 ohm and sensitivity at 88 dB.
As to those Apollon amps from Europe, I wonder if they offer a trial period and return policy if I don't like them or any issues or problems arise.
Regarding class D amps, I have a buddy in Denver who is recommending Starkrimson Mono's but the output is 150 watts. They offer a 500 watt amp, but it costs $2500. Know anything about these? I like that they are in the US.
https://orchardaudio.com/shop/starkrimson-mono-premium/
Regarding the Krell amp, yes, I can only guess over $200 for ground shipping or freight.