2 p/c's 1 22" monitor each, one to game on and one for my notes, INARA and other shortcuts like http://coriolis.io/ , https://eddb.io/ and so on
I have three monitors, all 1440x2560.
BUT I find the image edge distortion far too much if I use all three, so I use just the middle one with real life stuff on the other two for the game. I really, really wish that we'd get multiple 'cameras' at some point, one for each monitor.
Beautiful !
I use three main 28" monitors, but have a number of ancillary USB monitors for Teamspeak, Inara and ED Discovery.
http://i.imgur.com/rsgsjy5.jpg
Sorry about the picture quality, the room was dark and I was using an iPhone.
I fly with the now defunct X65F and one of those European MFG Crosswinds pedals sets.