Hey, you are interested in Operating Systems ?
Ok, I can help you, you need to try out z/OS ! Haha. No just kidding.
Well there are "OS" and "os" and "ooh-SOS".
Linux isn't a bad "os". And there is a famous "ooh-SOS" for your Laptop,
but there is for sure only one "OS": Solaris.
Go to
Home at OpenSolaris.org and enjoy ZFS, Zones, Xen, Dtrace, SMF, Crossbow, and so on. Not mentioning things like SunStudio, Netbeans, Glassfish, VirtualBox.