do you need it for a laptop or a desktop? what wireless technology are you using right now from a gateway/router standpoint?
Ultimately, if you have the extra money, go for 802.11g and i would recommend either linksys or netgear. If you go for either of those, get a gateway/router and a NIC from like manufacturers. and i would recommend 802.11g with a capacity of 108mbps.
::mike