it's much of a much-ness then for WiFi adapters there's a standard that they have to stick to, ideally buy an adapter from the same manufacturer as the router but that's not all that important
pretty much any of the main brand names should do it just be sure to check the manufacturers website before purchasing it, whilst the install CD mightn't have the driver the website may do
personally I'm using a Netopia 3d reach adapter for about 4 years with issues only starting to come up - but I don't know if they're still sold
I hear Zyxel make reasonibly priced and usable adapters but have no experience with them
and with Belkin lies the path to tears - I would avoid like the plague
net-gear are alright but can get buggy with other routers
TP-Link are cheap and usually quality again no experience with them