It makes me think the Original RF-7s were the last "upgrade" to what they replaced....Of course, that's my 2 cents and it seems that Klipsch later speakers do seem to compete well at the various price points.
I think the RF-7 II were a fantastic upgrade to the originals and all the ones in between. IMO they are the best looking and sounding speakers (haven't heard heritage or Palladiums) to come out of Klipsch.