Best all around diagnostic software.

This oughta be an easy one. I own a break/fix computer business and have found alot of answers on this site and thought it would be helpful to find what software most of the experts here are using for diagnosing all kinds of PC problems; HD, memory, processor, Windows errors etc. Thanks and Happy 4th.
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regarding hardware:
memtest86+  free
-RAM,CPU,NET etc.:
MicroScope from Micro 2000 ,but costs
also see BurnINTest from Passmark

regharding hardware also software ,but more informative/benchmarking/system optimizing:
Everest Home edition free
Sisoft Sandra 2005     free
Unknown devices
other good tools are windows system based tools such as eventviewer,msinfo32,device manager
for networking common tools such as netstat ,ipconfig

monitoring tools:
Motherboard monitor  requires cpu and motherboard sensors

I like/use this one:
Ultimate Bootdisk and diag utils:

Another one:
Knoppix <can get it here>
mpcmAuthor Commented:
Thanks for the advice. I'm checking them out now. I increased the value so I can split them among you experts.
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Word of warning, if you are not use to DOS type commands, UBCD might be a little confusing at first. But worth the learning curve.     : )
mpcmAuthor Commented:
I'm comfortable with DOS, but could always learn more. Thanks.
Here some more links to useful progams :                              Driver magic for driver problems                                                                PC doctor                                                                memory test                    Dr Hardware                                 modem doctor                                                    driver guide Toolkit

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mpcmAuthor Commented:
Thanks to all for your help. Hope I can return the favor.
Thank you much.    : )
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