Not to be a downer but 99% of computer problems are linked to user error. If you're having so many problems with your computers I'm not too sure you'll find anything different with a new operating system or new computer.
I've used every operating system under the sun, and have never had a problem with crashes, bsod's or any other software related problems.
My advice, is and will always be build your own. Even if you don't know how to do it, BUILD YOUR OWN. It's just like putting together a home theatre. Do you feel good when someone else comes in hooks everything up then leaves you to your own devices? Once you educate yourself on what makes your computer do what it's doing, then fixing and taking care of it will come second nature.
In reality, putting together a computer is easier than assembling your home theatre. There are less connections and they pretty much can only go in one spot.
P.S. I haven't read the entire thread, so this might be out of place
P.P.S. Mac's are for little girly men.