Most business computing doesnt require a lot of processing power so based on what type of applications most likely you are going to find that the Intel® Core™ i3 is able to do what you are looking for well. I would have no problem using the Intel® Core™ i3-3225 on an office system.
It all depends on what programs will be running or have open at the same time.
If all those programs are going to be processing something at the same time, then a Core i5 will be the better option. If they are basically going to sit idle until you switch to one program to do work, then a quad core CPU is not necessary.
The Intel HD 4000 can output to two monitors at the same time.