Most coolers these days fit multiple motherboard platforms.
Just check that AM3 is supported.
And... some coolers are 160mm in height. If you are using a small form factor case, that will be an issue.
If I am not mistaken, the FX-6100 includes a cpu cooler.
You might want a better cooler if you are overclocking, or if you want your cpu to be more quiet under load.
May I ask the purpose of this 6 monitor build?
Typically, it is for a stock monitoring system.
If so, go down to compusa and look at the seiki 50" 4k display demo. The picture is stunning! $1000 or so. The single 3840 x 2160 monitor has about 8m pixels.
One could size each chart individually and move then around on the single display space