if you use the debian sarge installer floppy version you can install unstable right away, without ever using testing. Iīm not sure if it asks in normal mode but start the installer with expert and it will ask you which debian branch to install. Apt-get will also be automatically configured to have sid mirrors.
edit: perhaps the cd version has this feature too, I donīt really know but at least the floppy version I had worked like this.
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