+ 1 to what @dbphd wrote.
My Mac Mini and a Magic Keyboard and Magic Mouse are a great way to share streaming content with a group - or browse by myself. This was a no brainer when I noticed the HDMI output on the mini.
I have the keyboard next to me on an end table when it isn't on my lap and use the mouse either on the arm of the seat or on the seat cushion next to me. (An Apple Magic Trackpad may work better for others. I use mine occasionally.)
No problems with HD (720 or 1080) either. Looks great on my set. However a lot of older pre HD content streamed via YouTube or Prime does have that old aspect ratio and graininess. Doesn't bother me.
The audio portion of the streaming content runs to a DAC connected to the Mini's USB port. I've had zero latency (lip synch) issues with this setup.
An Apple TV is also a great addition so that Airplay can 'cast' photos, videos, and other iPhone content onto that big screen for group viewing.
T.