Defride,
I own the Kharma .I have been having it for the past few years.What It does best:
1}Transparency
2}Dissapearing almost like an open baffle and electrostatic speakers.
BUT,The speaker is so unforgiving to inferior electronics,cablings ,resonance control Etc...
If you set it up properly ,you would be in Audio Nirvana,very few speakers could come close ,let alone bettered it.
Focal Diablo is what I call a "nice" speaker.It Does ALL things right ,BUT The "goosebums' factors are not there.
The Avalons I have heard are limited to hearing them During HiFi shows,I think they have a certain Characteristics-the Avalon sound.The Lesser models are not very impressive.
If you decide to go with the Kharma,you need to change the amp.If you need to keep things as it is ,you probably would be safer with the Focal...