Inspiron 660 Wireless Network Card upgrade?

Hello,

I am wondering if there are approved/compatible WLAN cards to replace/upgrade the Dell 1506 model which came standard with the Inspiron 660.  Mine seems to be acting up (intermittent connectivity issues which do not affect two other Dell's in the same home).  I have upgraded the drivers and performed Dell diagnostic tests, but there is still the occasional challenges to connect and stay connected.  Perhaps it is on its way out?

Searching for products here at Dell seems to give me every other possible card than a network one.  Links to suitable replacements would be appreciated.

Thank you.