surge protectors and line conditioners can actually do lots of good for electronics. now some pieces of gear have very good powersupplies and themselves are protected from most poor quality power conditions.
But at the end of the day having an inexpensive device that will sacrifice itself rather then your far more expensive gear is in fact worth it.
check out the belkin power centers, also look at anything from APC (made a name for themselves doing stuff for large data centers).
The studio I work in uses equitech balanced power units to clean up and protect the gear. and the server farm at large network installations that i manage use apc data center products.
there is a reason that studios, datacenters, theaters use power isolation, or line conditioning or surge protection gear. It extends the life of equipment, it protects equipment from catastrophic events like lightening, and it can improve performance of equipment (and not a pseudoscience claim like using fancy power cables).
emotiva states that their amps shouldnt be plugged into surge protectors or line conditioners because it limits the power going to them. but you can get whole home surge protectors to protect the amp, and also large toroidal power units like equitech gear that won't limit current.
do some more research and you will find that there is more to this then meets the eye.
should also state that there is a difference between a line conditioner and a surge protector. a surge protector stops a catastrophic surge of electricity from reaching your equipment and damaging it. a line conditioner smooths out high AND low voltage conditions which extend the life of gear, improve performance (by cleaning up noise in the line) and protect it from dangerous (to you and your gear) surges.