$450...$650... $1000... Who cares?
$300 for "super-puper version"- critical limit. Nobody will buy OS for $450! Even if OS is very "promising".
Or... Everybody will use pirated version. Why? Just think.
It's just stupid to pay $400-600 for OS! Don't tell "sad stories" about "OS is main part of your system". We still have good OS - WinXP. We already have "more or less good" alternatives at least for office use. 95% of people just don't need "cool stuff" included in Office2007. Yes, very nice UI, cool features. But most of people can live without them easily. Games? Good question. Even for gaming we don't need Vista now. XBOX, PS2, PSP, Nintendo, XBOX360, PS3... Yes, FPS and RTS on consoles SUXX. But all we need - just proper gamepads. Not whole OS for $(4,5,6,7,8,9)00.
Ferrari/Lamborgini are not public cars. Too expensive and unuseful for ordinary people in ordinary live.
My price for "Vista Ultimate" - $250-300 for "box".
Final question - why we need Vista?
Security? Marketing fake. What else?