Sure Linux is worth it, I agree that windows creates some bad habbits that die hard. But computing reaches a new level using linux.
You may have problems with your gaming though, but linux has so many opportunities you don't need gaming
Regards Paul
I recommend Gentoo. I have some experiance with Debian and sid, but not with knoppix.
Gentoo has a very good installation manual, and overall documentation. And if you should encounter problems, visit the friendly forum.
Good luck
Paul