Need help buying an iMac g4

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someones asked me make them reasonable offer on imac g4 need deciding how reasonable offer, i'm in uk it's in gbp
note has broken cd drive.
here's specs:
17" screen
1.25ghz powerpc processor
256mb ram
80gb harddrive
os x 10.4.11(tiger)
5 usb (3 on computer, 2 on keyboard)
wifi enabled airport card

keyboard, mouse & speakers included.

 

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ideas?

 

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