I recently spent some time with the Gaems M155 Portable monitor, and I love it... with a few reservations.
It's compact, lightweight, has a built-in speaker and comes with a remote control. It's damn near perfect for playing a little PS4 on, working watching content streamed to an Apple TV or using as a second display. My only real beef with it is its lousy viewing angles. It's great if you're sitting right in front of it. But if you want to watch something with someone else or play games with a pal, one of you is gonna have a bad time. Still, for under $200, it's a tough piece of hardware to beat.
For my full review, click here.