If you like speed
- I recommend SL8-xfce edition,
AND only CLI
is your game; then the SL8-spinbase edition is something to look at. This one is totally "bareminimum" where you can build/install/conf anyway u like.
Entropy is the official prebuilt rep for sabayon, but it has support for Portage (from gentoo) if u want another type of power.
Finally, one of the dev (wolfden) have made a daily experimental forensic edition. (not personally tried it yet, but im planning to): http://wolf911.us/wgo/?p=633