I don't understand why having several boxes is a problem for the swivel wall mount, but not for a ceiling/etc mount? Either way you have to have the boxes somewhere, and I assume you didn't intend for them to be hanging from the ceiling..

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The wall mount is simple. You can use a mount like this:

![Monoprice wall mount][1]

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Put all your other equipment in the wardrobe/closet. Get a couple long HDMI cables (or whatever you need) to connect to the TV. 

Alternatively, you can also get wall-mount shelves for mounting equipment, if you don't mind seeing it sitting out (and of course, you can use any random shelf from anywhere, if you like): 

![equipment mount][5]

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You can use an IR Repeater so you're able to control the devices even if you can't see them.

![Smarthome IR repeater][4]

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You can use some kind of cable wrap or wire raceway (eg Wiremold) to route the wires over (which looks WAY neater than just having a bundle of wires):

![velcro cable wrap][2]
![wiremold raceway][3]

Alternatively, if you're really adventurous, route the wires through the walls (and/or ceiling). Since you're on an exterior wall this would be a huge pain (due to vapour barrier and insulation), and personally, I wouldn't do it. 


  [1]: http://i.stack.imgur.com/mcxTf.jpg
  [2]: http://i.stack.imgur.com/AOdi6.jpg
  [3]: http://i.stack.imgur.com/EASge.jpg
  [4]: https://www.smarthome.com/images/59501dgm.gif
  [5]: http://images2.monoprice.com/productmediumimages/57151.jpg