What kind of games do you play? If you play a lot of open world stuff or racing games, you might want the 3 monitor setup.
If you play a lot of FPS, you might want the larger FOV with 3 monitors. However, if you play competitively, you might want the 120hz monitor to get fluidity.
If you want a cinematic experience, go with a 1440p monitor. You can get a really good one for about $620 AUD
Each of those options requires a bit of GPU muscle to power it all, though
I do both. Got 3x24" screens with only one able to do 120Hz.
But I usually only do 120Hz on the one screen.
For FPS games like BF3 the framerate really matters more. In single player games like Mass effect and Skyrim I use nvidia surround to get the nicer cinematic effect.
I agree with NIsse, if you can do the 1 120hz with 2 others, I would. I love my 120hz, so sexy smooth... I even like how smooth the mouse is... Yes, I'm weird.
I am just like you. I would appreciate things like that whilst using a computer. and i will most likely go with that option. Buy two identical 60Hz monitors and then look out for a cheap 120Hz
Just be abit careful when choosing missmatched screens if you are going nvidia.
I do not know if they have fixed the problem in the later drivers, but when I did this setup a year ago I really had do look closely at which screens worked together. I have 2 Dells and one 120Hz Alienware (which is also dell).
What was really important then was that all screens could support the same res@hz. i.e. all att 1080p@60Hz. Some screens run [email protected] which would not work with a 1080p@60Hz for surround.
AMD are apparently fine, there you can missmatch all you want.