Most apps suck on smart tv's
Most people find that the implementation of smart features on most TV's is very poor. They tend to be sluggish and glitchy. You are generally better off using an external device for the smart features such as Roku, computer, blu-ray player, game console (heck even a lot of AV receivers now). This still may not be the best deal for you, but keep this in mind as you continue your search.
Cannot agree more with this...why people like netflix or hulu from the tv app is beyond me. Once I got a roku....I will never go back to the apps on smart tv. I have a nice samsung and I prefer roku or PS3 for streaming.