Isn't PSK a type of auth/encryption for WPA? So it doesn't make sense talking about them as alternatives. And if the best thing we can do is encrypt everything, why did you just say it's a waste of time to encrypt everything? WPA, even PSK, is as I understand it rather strong at the moment, as long as you use a properly obscure and long key, so you're not in the rainbow tables, or caught early in a brute-force attack.