Lightweight desktop's [closed]

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http://askubuntu.com – Possible Duplicate: What different desktop environments and shells are available? light weight window manager/desktop environment like unity Hi I was thinking about try a lightweight desktop for my Ubuntu. I like Unity but am just curious to see how well they work. But I don't know where to start, theres L and X Ubuntu, whats the difference's between the two ?, I read X is not very lightweight and L is very ugly. My PC is of reasonable spec so which distro's are not just for underpowered machines ? Can any one suggest any others to try ? (HowTos)