I have a comment - Seems to me he has a real nice set of speakers already. They will shine with a new AVR that has HDMI - assuming that Pioneer is as strong as his old Denon. Unless he is swimming with money and just wants new speakers - I would absolutely keep what he has and see how that new AVR delivers
EDIT - duh! Just looked up the Pioneer AVR. Sweet! No way would I get new speakers until I have that thing hooked up and see how the Klipsch deliver. I think they will sing just fine.