You've done all you can. Just make sure the key you use is sufficiently long and random.

Turning SSID broadcasts off is useless as a security precaution. It'll only make it more difficult for you to use your own wireless network. Same goes for MAC filtering, it's a useless exercise.

What ever you do, don't turn on WPS.

http://www.kb.cert.org/vuls/id/723755