By now you know that linux based operating systems are the best around. Since you learned addition and substraction in school you wouldn't fall for Microsoft's story about how something that's very expensive has a lower cost of ownership than something you get for free. You also know that 3GB of RAM costs more than 1GB. If you want to pay for OS and expensive hardware you will probably by a Mac.
With your supposed lower cost of owner ship OS, you need to pay for support but with linux there is plenty of free support out there. What's more there with most unix like operating systems is that you get loads of interesting articles to read. This site hopes to add to that clutter.