Best internal wireless card for Optiplex 3040

Hi,

We have a number of OptiPlex 3040 SFF desktops that we would like to join our wireless network.  These PCs do not currently have a wireless card installed.

I'm finding it difficult to find a recommendation from Dell for a compatible/supported internal wireless card. Can anyone advise what wireless card Dell recommend for use with an OptiPlex 3040 SFF.

Thanks,

Colum