I say go big or go home! Lol bigger the better! I just recently added a 3rd monitor (got a free one from hubby's work) and while they are different sizes- I LOVE using 3! Sometimes I just watch Netflix on one while using the other 2 for scrapping... or one for all the previews of the supplies I'm using etc. I'm on my phone so I can't seem to link my desk pic- but here's my setup!
https://www.flickr.com/gp/139774214@N02/014W0M