By default, the newest version of WordPress is pretty darn secure. The development team of WordPress has considered anything which may have been added to any fix hacked wordpress database plugins. In the past , WordPress did have holes but now most of them are filled up.
Strong passwords - Do your best to use a password, alpha-numeric. Easy to remember passwords are also easy to guess!
I don't think there's a person out there that after learning how much of a problem WordPress hacking is that it is a good idea to enhance the security of their blogs. Something I've noticed through the years is that when it comes to securing their sites, bloggers seem to be stuck in this state that is reactive.
You could even get see this page an SSL Encyption Security to your WordPress blogs. The SSL Security makes secure and encrypted communications with your blog. So that all transactions are recorded, you may also keep history of communication and the all of the cookies. Be certain all your sites get SSL security for protection from hackers.
The plugin should be regularly updated play nice with your other plugins to stay current with the latest WordPress release and have WordPress cloning and restore capabilities. The ability to clone your site (along with regular backups) can be useful if you ever want to do an offline site redesign, among other things.