To test this critical aspect of hosting, we include uptime monitoring as part of our review process, and the results show that most web hosts do an excellent job of keeping sites up and running. Sites with uptime problems aren't eligible for high scores, no matter how good the rest of their offering may be. All services suffer ups and downs, sometimes for reasons beyond their control. Those sites that fail to quickly address the problem are penalized accordingly.
You can also purchase Secure Sockets Layer certificates (starting at $69.99 per year), the software that's represented by a green padlock in your web browser when you visit, say, a financial institution's website. If you plan to sell products via your website, consider an SSL certificate an essential purchase, as it safeguards the data exchange between a customer and your servers.