If you really want to protect it, get phantom frog
www.phantomfrog.com
Not only will it let far less people in, but it has an automated user password recovery so you have to deal with customer password questions almost never.
I've been using it for a month now, and even with my smaller member base have noticed a drop in BW but more importantly the content has all but stopped showing up on the content sharing boards.
And bill is great to deal with, even has a phone number that he will answer at any time, unlike strongbox, and not sure about proxypass.
The guy that got me to use phantomfrog used strongbox befor and said there is no contest that phantomfrog is better.
There is a free trial on the site linked above to show how many user names get multiple accesses from multiple countries and still arent blocked.
Good luck with your pick
