Love my two 23" monitors, don't know how I coped with only one.
 
I have Sonar spread across both screens, using it like one wide monitor.  The track view looks so cramped if I have to use one now.  Screensets mean that I can have Track View on and console on the other, or have the Console/Track View spread across both.  It's great.
 
I have contemplated a third, but can't think where to put it where it won't interfere with my "Audio" monitors.
 
Have fun, Jon.

If you need more space for monitors, this thing is cheapo:
 
http://www.ikea.com/gb/en/catalog/products/50251350/
 
Served me well, but obviously its not solid wood.
 
Oh, and a solid wood one:
 
http://www.ikea.com/gb/en/catalog/products/50106773/
 
... No I dont need to upgrade my desk :x

My problem is low vision. I am constantly dragging my pointer to a corner just to locate it. With two monitors that became a huge problem locating it. For me, it would have to be a mouse for each monitor or not.

Have you tried using pointer trails and setting the pointer option profile to extra large?

The thing about two monitors is their so handy. Not just for Sonar and the like but darn near all computer usage will benefit from having them. 
 
I've been using two monitors back when Pro Audio was out. I find it hard when I don't have both.
 
If I were to get a third monitor it will be a touch screen and and will take the place that my MC now occupies. The MC wont be  abandoned but I will have to find a new place for it. Or get a much bigger desk.
 
The ones I have now are wide screens and work as well as any except better. Plus being LCDs and thin and flat they just look nicer.   
 
Another tip is having two separate task bars. I use Classic Shell and Star Dock. One on each monitor.
 
Life is good with two monitors.  

Currently in the process of upgrading OS and HD after a HD failure. With Win 8 I will definitely be looking at adding a second monitor to accommodate incorporation of touch in the CV. Really looking forward to that!
 
Regards,

Vab
If you need more space for monitors, this thing is cheapo:
 
http://www.ikea.com/gb/en/catalog/products/50251350/
 
Served me well, but obviously its not solid wood.
 
Oh, and a solid wood one:
 
http://www.ikea.com/gb/en/catalog/products/50106773/
 
... No I dont need to upgrade my desk :x

Nice, but I can't see how I could keep the correct placement of my nearfield monitors, if I got a third screen.  They are already a little too far apart.

jb101

Vab
If you need more space for monitors, this thing is cheapo:
 
http://www.ikea.com/gb/en/catalog/products/50251350/
 
Served me well, but obviously its not solid wood.
 
Oh, and a solid wood one:
 
http://www.ikea.com/gb/en/catalog/products/50106773/
 
... No I dont need to upgrade my desk :x

Nice, but I can't see how I could keep the correct placement of my nearfield monitors, if I got a third screen.  They are already a little too far apart.

Agreed. I'm trying to figure out how to place it above the other two. Maybe a movable arm of some kind.

joel77
 
 
Agreed. I'm trying to figure out how to place it above the other two. Maybe a movable arm of some kind.

Watch for neck strain.
I have an Argosy desk that only has room for one widescreen monitor, so I bought a stand that allowed me to put a second monitor above.  After 10 minutes of use my neck hurt and I went back to a single monitor :(
Still don't know how to place a second monitor with my desk, which is awesome in every other aspect.

Completely agree John.
I have been using 2 monitors for many years now.
For new DAW, I have upgraded from two 17" to two 27" ultra slim LG's. They look amazing and there is so much workspace. Might add a 3rd one for video or a touch screen (this would be great…and I would have it horizontally like a desk…).
Less is more doesn't work for monitors on DAWs ;-)
 

John
The thing about two monitors is their so handy. Not just for Sonar and the like but darn near all computer usage will benefit from having them. 
 
I've been using two monitors back when Pro Audio was out. I find it hard when I don't have both.
 
If I were to get a third monitor it will be a touch screen and and will take the place that my MC now occupies. The MC wont be  abandoned but I will have to find a new place for it. Or get a much bigger desk.
 
The ones I have now are wide screens and work as well as any except better. Plus being LCDs and thin and flat they just look nicer.   
 
Another tip is having two separate task bars. I use Classic Shell and Star Dock. One on each monitor.
 
Life is good with two monitors.