[Test-Equipment] Mains protection for work bench test equipment?

[davec]

I've got a nice 6-foot, 20-outlet power strip strapped to the back of 
my work bench. It does not, however, have any surge protection or 
filtering.

What kind of protection do y'all use for mains power for your test 
equipment? Surely not the cheap "surge-protector" power strips?

Is there some protection I can add prior to my power strip that will 
be sufficient to protect my equipment investment?

Recommendations welcome.

Thanks,
Dave