what will you be using it for? just attaching to AP's? or hacking?
If the first suggestion applies, then mostly any PC card should work. What you do is find some at a store that has a nice return policy and simply test drive them until you get one. (like ethermine does)
If the second suggestion applies, try an apple airport card they work with madwifi-ng because of the sexy Athero's chips.
Also, Broadcom, sucks but works for just attaching and surfing and sharing, cards work with ubuntu out of the box.
