So I decided to order one 24" and see how it went with the possibility to get 2 more later and turns out I love it!
Haven't had much trouble setting up SoftTH with some of the games I tried, I got it working so far with World of Wacraft, Dirt 3, Dragon's Prophets, Grid 2 demo, War Thunder, World of Warplanes and Rift. Most games don't need any modification, drop the DLL, start the game and select the new resolution.http://imageshack.us/scaled/thumb/580/m9yi.jpg
I am running each monitor in their native resolution and it looks really nice (1280x1024/1920x1080/1280x1024). The 19" are the same height as a 24" monitor so it fits nicely. I had to lower my graphics settings from "all ultra" to "all high" to get above 50 fps thought so I can't imagine with 3 x 1920x1080 lol
PS: I might still return it and get a 27" in center since I noticed the difference in PPI really doesn't both me.