Suse is an ok one for a beginner....it updates itself on it's own and is a lot more XP-like
I'd recommend using the KDE environment at first until you learn more about the various commands and then try some different environments and see how you like them.
I'm personally a fellow Slacker as well (I use Slamd64 on my laptop and Slackware on my PC) but I'v also uses versions of Suse, Red Hat, Knoppix, Slax, Auditor, Mandrake.
Just try a bunch and see which one best recognizes your hardware and which one you find easiest to learn on
Go to their native webpages for information on them and manuals and forums, etc.
It will be much easier for you to have a seperate PC running beside your windows machine so you can go back and forth with tutorials and such, as your hardware may not all work properly on your first intall