Automated Web Security Testing
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I know that no automatic service can be relied on for website security, but it doesn't hurt to have this as one line of defense. 

I wonder which of the following might provide a better, more thorough scan for an e-commerce site?

1) McAfee Secure  
2) Symantec ("Norton secured powered by Verisign" badge)  
3) Network Solutions SiteSafe ("Safe hacker tested" badge)  
4) Merchant Safe Security Scanned  
5) Trust Guard daily security check  

Or maybe there are others you can suggest ...