Sorry, I don't know anything about those turnkey things. Get a Debian Live CD, it can be used to bootstrap a really minimal system (although the results will be the same as using the install disk and deselct everything when asked what to install.
Basically you do it it this way:
1. Boot from the live CD, mount your partition.
2. Use debootstrap
to install a minimal system to that partition. See
for more information.
3. Bind-mount /dev, /proc and /sys on the new install, copy over your /etc/resolv.conf so that you have network access and chroot into the new system.
Info for that with
4. Create the /etc/apt/sources.list file, pointing to a valid mirror.
5. Use apt-get to install a kernel and the bootloader of your choice and other software you want to have installed, like a text editor.
6. Exit from the chroot, remove all mounts and reboot into the new system.