What is the best option for hiding wires to wall mounted TV?
I'm a fan of the recessed media box that monoprice sells. I installed it pre-drywall which I'm sure is easier, but it does have the ability to be installed as a retrofit (you don't say in your question which way you're doing this).



There's two major issues with having actual connectors in the wall behind the TV: you have two additional connections per wire (there is a connector on both front and back), and you have to manage cables behind the TV. Connectors are bad because they can become loose and are bulky. Wire management is an issue of getting long enough cables that you can actually plug them in before the TV is mounted, and not having an unsightly mess behind once it is. 

The media box solves both of these problems, because the wires just hang out, and you can push the extra back in after you've mounted the TV. 



In my case, I ran cables from the box back to some regular wall jacks, which then go to my receiver and other gear. I used a couple pieces of central vac conduit I had left over, which go over about 4' to the furnace room, which is a non-finished wall and directly behind where my actual receiver etc is (off to the side of the TV). This also makes it easy to add additional wires, but of course it depends on your setup if you'll be able to do this.