Song's fleet is complete, so no need to worry about the IFE aspect. Song departs Terminal 2 at JFK
Connection uses Terminal 3 and requires the use of buses from the plane to the Terminal. All in all it will probably take you about 20 minutes to get from the plane to the Song gates at Terminal 2. ERJ
-145 is not a bad aircraft (unfortunately I don't really know how to describe it). I like the A seat on the Embraer RJ
It's a big building with patients, but that's not important right now.