^^ Agreed, try Fedora core. it is the newest opensource release by Redhat:
http://fedora.redhat.com/.
if you have no OS and want an OS you can get ubuntu and Kubuntu disks shiped to you for free:
Ubuntu:
https://shipit.ubuntu.com/
Kubuntu (*buntu with KDE):
https://shipit.kubuntu.org/
Edubuntu (education Version):
https://shipit.edubuntu.org/
and of course Xubuntu (Xfce desktop Environment), which doesn't have have Shipit as yet but I'm sure will become availible soon
http://www.xubuntu.com/
if you still want to check out other distros try these linux distro choosers:
http://eedok.voidofmind.com/linux/chooser.html http://www.zegeniestudios.net/ldc/
hope this Helps,
Jake