Look for the price of an Apple Airport. It has more features then any of the other 802.11HR bridges I have seen, and it's cheaper. ($300 is what I paid for mine, seems to be priced the same everywhere). As for the PCMCIA cards, I bought the 3Com WaveLAN for $158 online.
Plugging in the Airport will keep it a basic bridge. Using a SNMP configuration program called "Configurator", you can change a few things. Or with a Mac, you can change everything, save the files, and use the Configurator program to upload them to the Airport.
My empeg site is:http://24.236.3.131/empeg/