If you do a little searching in the forums, I think you will find all the information you need.
FWIW the term "power conditioner" implies that the device will somehow improve AC power quality, IOW deviations from a pure sine wave. This is quite different than a surge protective device which simply protects connected equipment against one type of power quality issue: surges. Most consumer power conditioners have filters intended to reduce noise on the AC line. They will generally have some form of surge protection as well. And some will have automatic voltage regulation as well.
The question you have to answer for yourself is: will any improvement in the quality of the AC provided by a power conditioner improve the performance of you audio or video gear? Many who seem to be in the know here think not, at least with typical CE power conditioners. Others think so.
As far as surge protection, power conditioners are going to have pretty much the same kind of MOV-based or series type surge protection as you can buy in a surge protective device for somewhere between a few dollars (MOV-based) and a couple hundred dollars (series type).