You are right about the KLF-20 being dynamic. They are beasts that play loud and clear. I have been using an NAD pre-pro/Acurus amps combo to drive my Klipsch RF-63 system and the combination is wonderful. The 63's are probably not quite as revealing as the KLF-20s but do also excel with dynamics.
As mentioned maybe a used or refurbished flagship AVR or near flagship would help keep your cost in line with your budget. An NAD T775HD2 may be an option but it comes in about $300.00 over your $1000.
https://www.audiogon.com/listings/receivers-nad-t-775hd2-t775hd2-3d-ready-home-theater-receiver-with...
Or the T765HD2 at your $1000.00 budget.
https://www.audiogon.com/listings/receivers-nad-t765hd2-t-765hd2-3d-ready-av-receiver-with-warranty-...
Bill
As mentioned maybe a used or refurbished flagship AVR or near flagship would help keep your cost in line with your budget. An NAD T775HD2 may be an option but it comes in about $300.00 over your $1000.
https://www.audiogon.com/listings/receivers-nad-t-775hd2-t775hd2-3d-ready-home-theater-receiver-with...
Or the T765HD2 at your $1000.00 budget.
https://www.audiogon.com/listings/receivers-nad-t765hd2-t-765hd2-3d-ready-av-receiver-with-warranty-...
Bill