Any Broadcom based card should work with OS X. It might be tricky to get it working in Linux, depending on the card.
An Apple card should work, but it will most likely cost more.
I've also read several threads saying the N cards get very hot, just so you know.
Mini 9 | OS X 10.6.7 | NBI 20100616212351| BIOS 05 | 32 GB Runcore | 2 GIGS RAM
10V | OS X 10.6.7 | NBI 20100616212351 |BIOS 06|160 GB|1 GIG RAM| 6 Cell Dell Battery
Back up Mini 9| OS X 10.6.7| NBI 20100616212351| BIOS 05 | 32 GB SuperTalent | 2 GIGS RAM