Switching off Broadcast SSID really doesn't help and can hinder you adding new stuff to your network.
You can get completely random characters for setting the access phrase.
http://www.yellowpipe.com/yis/tools/.../generator.php generated
IPd5xfoB6Yd/gMAand\ey5Uj7xEOU5PnU\sGXWRc%\caGm/%E$X3+$l4o!S9%rw
If you really need to secure your wireless you can look at WPA2-Enterprise that uses different keys per user but that is likely to be beyond requirements and isn't so simple.