http://www.apple.com/pr/library/2007/10/16leopard.html
Dear Jobs is poking fun of Gates again.
Leopard, the sixth major release of Mac OS X, is the best
upgrade weve ever released, said Steve Jobs, Apples CEO.
And everyone gets the Ultimate version, packed
with all the new innovative features, for just $129.
Read the
bold parts.
Together with shipping and conversion, I figure this OS will cost
around $200 without the hardware.
Very tempting. 
With just a one-click setup, Time Machine automatically keeps an
up-to-date copy of everything on the Mac.*
This feature sounds like RAID to me.
* denotes that it requires an additional hard disk, just like
RAID.
You can pre-order it online now or just wait for it to be shipped
to SG.