Two years ago I even couldn't imagine my life without Windows. At that time I, probably, knew nothing about Linux, except the word :) It was usually for me to re-install my system after a regular virus or this 'magic' blue screen...
After several month I removed Windows from my computer, because I didn't use it at all. Linux gave me all, that I was needed. No, I'm not saying, that migration was fast and easy, but it was worth it!!
After 2 years usage, I can say, that Linux taught me think about the problems, taught me resolve them, taught me not to click blankly on GUI buttons, but with knowing what I am doing. From my experience I can say, that there's nothing too hard in learning Linux. On the first steps the only you need is to find out how to look for needed information, how to use built-in help, different howto's and so on.
- to pay your money for Windows and pray that the system worked well, otherwise the user will be unarmed (I don't even say about such universal things like reboot or more radical - system re-installation) on the one hand;
- or much faster, more reliable and usable Linux system on the other.
Good luck!! :)