Quote Originally Posted by Y
Driver support, system requirements, legacy support for games....
Driver support and system requirements are irrelevant if you're buying a new computer right now with modern hardware. Even if you have some old hardware, chances are that Vista comes bundled with the drivers provided the hardware isn't some obscure thing from Asia. I installed Vista on a friend's computer and it had working drivers for her ancient HP inkjet built in.

As for games, nearly all games that worked on XP will work on Vista either natively or through some compatibility tweaking. And to be realistic, you're not buying a brand new computer to play ancient DOS games.