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[DieHard]

Might be a good deal... 1 Left $59

http://www.ebay.com/itm/161471817883?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Not sure of Specs (Cache, etc)

[Protools5LEGuy]

I would choose this instead  , at least on Europe. That offer is USA only   
http://www.ebay.com/itm/Sonnet-Encore-ST-G4-1-0ghz-Upgrade-Processor-for-Apple-G4-most-models-/361113048471?pt=UK_Computing_CPUs_Processors&hash=item541403d597



Just because it is more know and have a bigger heatsink. (The fan seem almost the same height)
For a similar $$$,  ;


Not worth buying (Unless BT  )   Over 200$



http://www.ebay.com/itm/Sonnet-Encore-ST-G4-1800-1-8-ghz-upgrade-CPU-for-late-model-Power-Macintosh-G4-/111529479541?pt=US_Vintage_Computing_Parts_Accessories&hash=item19f7accd75

http://www.ebay.com/itm/Apple-Powermac-G4-1-8ghz-7447-Ultimate-G4-processor-like-Sonnet-/161469194871?pt=US_Vintage_Computing_Parts_Accessories&hash=item2598506277



http://www.ebay.com/itm/Apple-Powermac-G4-1-8Ghz-7447-Ultimate-G4-processor-Sonnet-Encore-/151462853650?pt=US_Vintage_Computing_Parts_Accessories&hash=item2343e3bc12


Dual overpriced ones... Over 300$

http://www.ebay.com/itm/Apple-G4-1-6-ghz-dual-processor-upgrade-Sonnet-Encore-Duet-/151483240254?pt=US_Vintage_Computing_Parts_Accessories&hash=item23451acf3e

[MacTron]

to notice that those are 7447...

I mean: usually the ones over 1.2 Ghz, except some NewerTech.