Lucent Technologies' WaveLAN and Orinoco cards have worked fine on my A1200. Bronze, Silver and Gold models of them..
Those are pretty common cards and you can see them locally all the time too. I just bought Orinoco Gold (128bit WEP) to replace my Silvers (64bit WEP). It was just 3e including the postage (from huuto.net) 
Some current examples:
Orinoco Gold
WaveLAN Silver 1
WaveLAN Silver 2
Or you could see if this comes in sale again 
BTW. prism2 driver requires kickstart 3.x, so it won't work on stock A600... only if you've upgraded the rom.
For other models I'd just try to read compatibility part carefully from the prism2.device guide.
Thanks for these, made the buying part really easy for me

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Purchased the WaveLAN Silver 2 card you linked, as it was dirt cheap :lol:.
About that kickstart issue, I'm ordering the ACA630/25 someday, so I assume I could Re-Kick the 3.1 rom with the Maprom function.