The purpose of this article is to guide you through the myriad options for upgrading to Windows Vista. My goal here is balance: I will not slavishly regurgitate Microsoft's hype, but neither will I join the growing army of Microsoft bashers.
The choices for creating a Vista computer are bewildering. Since there are so many possibilities, let me start by offering you a default solution to the main question: "what should I do about Vista?" My default advice is that you wait until June 2007 - then buy a new machine with either Vista Home Premium or Vista Business pre-installed.
From that default position, I'll review the other options for Vista. My goal is to give you the information necessary to make the best decision for your particular circumstances.
Source:Build a Windows Vista Upgrade Parachute