What you have is pretty much all you need unless you visit the dark side of the WWW or worse got kids. You also have the basics and that's all well and good. If you experiencing good results now, you needn't worry. I can only suggest if you decide to leave McAfee look at the freebie versions of Avast or AVG.
Q.I've got Microsoft's Security essentials+ the Windows Firewall. Is that enough to protect my pc? If not,what else would you recommend?