I couldn't agree more. In the past years, I've had the opportunity to run XP, Vista, Ubuntu, RedHat, etc etc, and can tell you with great accuracy that the Vista OS has been the biggest trouble in our IT environment, and thusly not used. It does appear that Win 7 might be a viable alternative to Vista, particulary because it's hardware requirements and it;s supposedly a less-resource intensive OS.
I've been running OSX for a while now and suggest looking into a Mac platform, as well. I run boot camp (Windows XP) when I need to and enjoy a low-stress environment in OS X the other 90% of the time. Not having to worry about worms, viruses, etc is also nice.