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I don't know much about Atheros specifically, what I do know, however, is the rule of thumb: the more you go fishing for state-of-the-art, bleeding-edge stuff, such as 802.11n, the harder it'll be to get GNU/Linux drivers for it. But then again, Atheros may be publishing open-sourced drivers for every equipment they put on the market, I wouldn't know. If they do that, they're highly commendable. What you need, is basically a simple Access Point. Any 802.11 card should do OK (it may be in the shape of an external USB unit, or a PCI card or even a PCMCIA card with a PCI interface, such as the ones sold by Belkin). The routing/firewalling functions will be performed by your box anyway, so you should basically look for a card with a good wireless section (meaning fast and long-range), GNU/Linux driver support and preferably 802.11n, as you said. Given the relatively low prices, I'd go for a top brand, shelling a few bucks more for added reliability, portability and compatibility.
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