Welcome to LQ.
When you say "AMD chipset" it's not obvious if your computer already has wireless. Also, is it a desktop or laptop?
I've had good luck with the Intel 2200 wireless and now the iwl4965. The latter seemed to work best after I upgraded my kernel to 2.24.
If you are talking about buying a wireless card, I would suggest some Google searches. Also, search here at LQ.