Which distro is best for my netbook?

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http://ubuntuforums.org – I just purchased an Acer Aspire One D270 and would like to give Linux a try. This would be my first ever Linux experience so my knowledge on the topic is limited to the basic research I've done. I've narrowed down my search to Ubuntu or Linux Mint. Where I get confused is when I see all the options available (i.e. KDE, XFCE, Kubuntu, etc.). I have no idea what any of this means. Basically, I'm looking for the OS to be: 1. Very light on the resources 2. Simple to use 3. Highly customizable (i.e. I'd like to be able to use custom themes) Any help would be appreciated. (Hardware)