You didnt mentioned in your post if you had the chance to test different distros in liveCD mode and now you just would like help choosing one.
For what I understan Linux Mint is a good distro to get people going in linux you can download it at this link --------------------> http://www.linuxmint.com/
(Make sure you download a light weight graphical interface)
Ubuntu is also a frindly Linux distribution for new commers -------------> www.ubuntu.com
(Again make sure you get a light weight graphical interface)
Finally I think OpenSuse is a easy to use and good all purposes distribution----------> http://www.opensuse.org/en/
(With a light weight graphical interface)
Before installing a Linux Distro test it in liveCD mode first by booting your computer from the CD once you have burn the ISO image in a CD. Make sure everything works in your computer. Graphical interfaces you can choose are LXDE and Xfce.
Good luck to you