In general Home theater and two channel are in two completely separate leagues. Two channel stuff is just going to blow away AVPs.
Reviews are the foundation for gaining knowledge along with whatever you can observe yourself. But, the source is critical. Read The Absolute Sound, Stereophile, and Hi_Fi +. The other stuff… well, make sure you have a huge knowledge base before reading them.
Puttimg together a high end Home Theater is a completely different thing. Different design requirements and focus. The video portion distracts you from the real details of the sound… so bass is frequently accentuated to add emphasis… a really low noise floor is not as important. Whole different thing. I have a high end home theater as well as my two channel systems.