I use MATROX TrippleHead2Go for the past seven years (lost counting).
Never had problems, always had three monitors connected
Always SLI.
Until, thanks to CoD
I had to run the game in single mode.
Then I realised (removing the second GPU) that I can have three monitors, 3840x resolution on a single 570GTX 1,3Gb
So, my advice would be:
#1 MATROX TrippleHead2Go
#2 If it is for CoD, do not bother (yet), three monitor view like IL2 does not work
~S~