A:
We chose to go with a Sanus full motion tv mount (it can go left, right, as well as up and down) for our daughter's 42" Samsung. She's very happy with it and we were satisfied with the price.
We used Geek Squad for the installation and they were awesome. They paid close attention to detail, set up everything form cable to blu ray to other peripherals that went with that television- and that was all included in the install price. The Geek Squad agents were super nice and I couldn't ask for a better experience. Good luck :)