I guess we should advertise GNU/Linux a little more...
We've got GNOME. Sleek as a Mac, but with the added sanity of support for PC mice buttons. Default extensions even give you back a boring, but convenient application start menu with all Apps neatly sorted in meaningful categories by the distribution of choice, which happens to be http://Debian.org over here. Still the biggest kid on the bloc. Get it for free while it's still legal to download free software. 😇