I was looking at the latest batch of 60" UHD TVs from LG and Samsung, but both of these are a fraction over 53" in width (plus the manufactures want a 4" or so of free air around their sets) so I'm going to need to budget for a router in addition to the TV. I like that the Samsung has an outboard switcher for the HDMI inputs (I can live without the analog inputs) as that reduces the cables being run to the mounted TV to Power, Network, and custom I/O cable. That's a lot easier to manage than running four HDMIs plus Coax to the TV (it's mounted on a set of drawer glides for easy access).
Like I said, and extra inch rabbit on either side of my opening, maybe two or three inches deep...