Choosing a linux distro is a matter of personal preference, but it will take some time and experimentation to figure out which one suits you best.
I take it you’re not a computer newbie, but a veteran windows user. In that case I’d recommend one of the more windows like distros.
OpenSuSE is afaik the only distro where everything is managed through a gui, from install to system maintenance.
You could also try one of the instant ready linux versions like PCLinuxOS or if you want bleeding edge and everything including the kitchen sink try Sabayon
If you don’t mind the terminal you could also start with Ubuntu, but I personally prefer the distro it’s based on, Debian.
If you are really committed to linux and want to learn it as fast as possible then I recommend doing a text-based install of either Gentoo, Arch or Slackware. The documentation of those distros is very good. Not only will it result in a very clean, fast and stable linux-installation, but you’ll have a working knowledge of linux as well. Something that will take a lot more time and effort imo with the so called newbie-friendly distros.
For starters I recommend keeping a partition or harddrive on the side so you can test a few of them.
My distro of choice is Gentoo, it’s the most customizable of all and has the best and most extensive documentation of all the distros I’ve tried (I’m also counting the forum). Because it compiles the entire system according to your personal settings, it allows you to make a system tailored to your exact preference and hardware.
Before someone asks, yes I’ve tried ArchLinux.