To the OP, unless I’m seeing it wrong, the Polk RTI A7 are not the same price as the Onkyo speakers. The Onkyos are $300 for the pair. The A7s are $300 each or $600 for the pair. I’d definitely go for the Sonys linked over the Onkyos. Sony has made some awesome speakers, as has Onkyo, but not recently and not released in the US. Obviously the monitor audio and Elacs are good choices too.
Dan
Dan