The best Linux distribution to try out for a very advanced Windows user

Which is the best Linux distribution to try out for a very advanced Windows user?

First of all, linux is very different that Windows.

Fedora Core 9 is a distro that a lot of businesses use.

Ubuntu is a great, simple to use distro. There are several different variations of Ubuntu: Xubuntu, Kubuntu and eduBuntu. Ubuntu is considered one of the best distros available.

PCLinuxOS is another great distro that looks great.

openSUSE is also runs good and looks sharp and professional.

I currently have 5 computers that can run linux and I think that Ubuntu is probably the best you can get, with Fedora and Kubuntu being close seconds.

I haven't yet tried this distro yet, but Gentoo is a distro that you have greater control over what you actually install to your computer, giving you more things that you want.
Just for fun you could go to http://www.pendrivelinux.com to see different distros you can install to a bootable flash drive. My favorite small-install linux is MCNLive.