You may find what you're looking for by checking out 'Distrowatch', if you haven't yet. I don't have the exact link handy, but google it if you've never been there. It lists all features and has general reviews of a lot of distros.
Also the LQ Distro reviews and screenshots may point you in the right direction.
I'm quite new to Linux, so my experience is limited, but from what I have **heard** and **seen** in pictures, Sabayon looks quite flashy. In my personal experience, Knoppix has excellent hardware support/detection and also looks nice.
Best of luck with your creation