Should be no need almost all of KDE 3.3 is available to you through the archives as it is. Check to see the version you have installed with something like this
COLUMNS=125 dpkg -l | grep 3.2.[234] because you will need this information to upgrade. What you need to do is take the list that you will get from the output and put them on one big long command
apt-get install -s -t unstable kdebase kdelibs kdm ..... so that you end up all the packages you need/want to install. When the simulation succeeds without telling you it needs so and so package (which you would add to the end of the line when it happens) then you remove the -s and let it install. Now you are going to run into a couple of packages that will not install and give you an error saying that it cannot overwrite a file that is in another package so on these you use
dpkg -i --force-overwrite /var/cache/apt/archives/package_with_error.deb then
dpkg --configure -a to configure the packages that were missed when the error happened you may have to put a couple of packages on the overwrite command line if more than one and may have to repeat the process a couple of times. All this of course assumes that you have a line for unstable/sid in your sources.list but I see you have SID for your distro so it should be alright if not then you need to put one in there.
