So fun it used to be when the craze started and we were building PC's and
giving solutions to customers who were really in need for and looking 
to get sorted out there requirements, it became easy for us as we were approached
by other customers who were referred, later technology got changed it got faded away in between,
and the requirements came down, today we see lot of customers have started doing the setup 
of there own as they have the requirement and they use there existing monitor and they 
add additional monitor for there productivity, encoding, editing, gaming, stocks and what not, 
just name it and its done. 

We came across lot of other sides of this thing, mainly on the setup requirement
be sure wether its required or not
have some extra space so that this can be done in some organised manner so that 
it can be used at par 
Better display card and need of the hour really goes hand in hand
Ambience and Asthetics too can be considered

Above of all make sure you use some athuentic and quality products to work.