for me I just try to isolate PSN as much as I can from the rest of my life. I believe that I met alot of good trustworthy people on PSN, but I still believe I must keep private info secret because data on the net can never be controlled once it gets leaked. So I believe don't ever put out what you don't want EVERYONE to know. And that same thing goes for psn. I limit what can happen. My psn password is separate from my other accounts in my life. I have used a card on it, but that card is specifically reserved for PSN use. So if anything happens, I can just claim credit fraud and shut that card down. Most credit cards will work with you on that. So my philosophy is less to prepare to stop a break security but rather to contain the damage that can happen if one eventually happens.
