Preamp and amp combo match Martin Logan Sequel 2

Slowing building up a new system. Does anyone have experience in matching a solid performing 7.1 channel pre-amp and equivalent power amp to a set of Martin Logan Sequel II speakers.

Like to cap the combination cost (new or used) at $5k-$6k.

For now, I'll only run in two channel mode, but want the flexibility of extending the systems use. Listening room is large (28' x 44') and fairly live. Musical preference: acoustical instrumentation, voice only, live jazz and symphony.

Thanks.