Uh, "download" Mac OS 10? Really?
Gee, I didn't know that Apple did that.
Why don't you just go by the stuff and be happy cause if something goes wrong (if you are talking about downloading a crack of Mac OS X then it will probably be missing a couple of things) then you just pop up the disc you bought and presto! All well again.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-