WPA-PSK with TKIP encryption with a 37-character password like the one you have is as close as you can get to a secure network - apart from AES. Did you check to see if your router and wireless cards support it?
Even without AES, I wouldn't loose one second of sleep over the security of my wireless

Get rid of the MAC filtering - it'll only give your attacker more info, and it's worthless. And I fully agree with your point on turning off SSID broadcast, Shag