Debian :: Running KDE 4.x From Squeeze - Manual Install

I have recently installed Debian Squeeze on my main machine at home. I used the default installation options, which meant gnome was installed as the display manager/GUI. Once I got the system up and running, I have attempted to install the latest KDE display manager/GUI. I executed the following commands:

$sudo apt-get install kde4

and then responded as required when asked if I really wanted to get and install the huge list of programs this involved.

When booting up in runlevel 3, I would log in, and then execute the following command:

$ sudo kdm

the screen would go blank and I would eventually get a KDE error message saying:

"Cannot open theme file @@@ToBeReplacedByDesktopBase@@@"

I would then be given only the option to press OK, which would dump me back out to the command line. I can get the GUI to start by executing "Startx", which doesn't require sudo to run I might add. The problem is that this command starts gnome. I would like to start X from the command line, but be given a choice of either GNOME or KDE.

Question 1: How do I fix the issue which generates the error message detailed above?

Question 2: How do I set up X to ask me which display manager I would like to use? and

Question 3: Am I correct in assuming that KDM shouldn't require sudo to run? If so, how do I adjust the situation so that it is correctly configured to run like gnome (without requiring root access to run)?