Hi Amjad,
Im also guessing that the refurbished iBook will come with Panther on it, but it is worth upgrading for.
Amjad you sound like a PC user (not to affend you if you are not) when you say
650$ for 1 ghz ibook is pretty price.....
The reason that is the 1Ghz iBook is still relatively new in the sceme of things. Macs run completely different then PCs (operating/ 1Ghz Mac VS. 1Ghz PC). PC is based on DOS as now Mac is Unix and so on and so on. It would take me literally days to completely explain the diffence but here is a link that should show you how they compare. With Mac you get better quality/customer service for the buck, PC you get diddly
http://www.digitalvideoediting.com/2002/07jul/features/cwmacvspc2.htm
I hope that help clear anything up. Good luck Amjad.
Jon