Any 4k TV recommendations?

I never figured a 27" pc monitor would feel too small, but with so much junk/windows sonar crams into the software, the need for a bigger screen is obvious...So I'm thinking about a 34 or 40" 4k TV...they look great up close, so the question is what is the best 'bang for the buck'? I read gamers concern is about response time for graphics but that would be less of a concern for me I would think as long as screen redraws,etc weren't visibly slow,etc....So if you use a 4k monitor, what is it and are you happy with the performance, also what video card do you use? Flat screen or curved? Do they even make 4k TV's with a pc sized VESA mount?...Most I've seen have the larger mount holes and wouldn't line up with my outstanding Ergotron arm, which is great because it makes the screen float and you can put a music keyboard halfway under it, etc.