Free OS - Perfect Desktop

Long long time ago, there I started my journey with RedHat like many others. Since than I have tried many different Linux distribution (and even OS like FreeBSD) in search for a perfect desktop.

other distributions I have tested recently are

Knoppix
Fedora
Libranet
Debian
Yoper
Ubuntu
Mepis
Mandrake
Ark
Vector
VidaLinux (Gentoo based)
Arch


Other free operating systems I have tested sometimes back are
FreeBSD
ReactOS