You are still using KDE 4.6.5. In the meantime there were two upgrades, one to 4.8.3 and the last one to 4.9.2.
I don't know if it would be possible to update your system in its current state. I believe it should be wiser to perform a new installation with the current 2012.08 KDE iso (with KDE 4.8.3) and then upgrade to KDE 4.9.2.
You could try removing broken packages first. But removing kdelibs4 will also remove the whole KDE 4.6.5 desktop.
Then you must immediately (without logout/login) install at least these packages: kdelibs, kde-workspace, kde-runtime, kdm, kde-baseapps-dolphin, kwrite and konsole.
This will give you a basic kde desktop and then you can use synaptic to proceed with the rest.
Again, I'm not sure how this will go and I strongly suggest to do a new installation.