Check the driver docs to see what's compatible. You can also get one from
Amigakit. Theirs is a little more expensive than what you might pay if you were to find one on eBay, but it's guaranteed to be compatible. I think dodging the hassle of tracking down a compatible card from another source is well worth the price difference. Plus you get their EasyNet software.
Yes, I expect that wireless bridge should work with any wired ethernet source, no driver required. You'll probably need a PC to set it up, though. I actually use a Linksys WRT54G router (with
replacement firmware) as a hub and de facto wireless bridge. Plenty of ports, but difficult to configure, and some hardware revisions aren't compatible with the replacement firmware.