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Does it specifically have to be debian? Because ArchLinux runs KDE4 very well.
There's even a community pre-built ISO - if you just want an instant desktop
Thanks everyone. I'll give Arch and Chakra a spin.
Which ATI card do you have?
If you dare to live on the bleeding edge and like the concept of rolling releases, there's also Sidux, based on Debian's unstable branch and fully compatible with Debian. Sidux uses KDE (or Xfce as an alternative) by default. Sidux has some nice extras, and tools that can at least warn you of some bugs and problems you might having upgrading your OS. http://sidux.org/