PC maintanence programs

[Willeh]

Hey, I've done a few searches on the forums for some decent / the best PC maintenance programs and have only dug up the following:

Tuneup utilities 2006
Diskeeper
CCleaner
Zonealarm Internet Sucirty Suite
Spy Search and destroy

Can anyone reccomend anything else that is good and can be used on a regular basis, I wouldn't mind having to buy it if needed, that won't be a problem. Preferbably a better HD defrag program?

Any help appreciated