I think Parasound would be a good fit with Klipsch, you can even get the 275 model which has about 90 watts per channel. They can be had for under 400 used for sure. But the 2125 or A23 are solid options.
im not sure if that Onkyo has pre outs for an amp, but if it does you’re all set.
im not sure if that Onkyo has pre outs for an amp, but if it does you’re all set.