What is the best BPO work environment?

What is the best BPO work environment?
 
If you are running a BPO, Call Center, Data Entry outsourcing company, or other outsourcing firm, you need to be refined in how to manage your work environment.  I had an interesting chat with a buddy of mine who runs a small web development company. He says that at many of the more successful American IT and marketing companies, everyone works in one large room, where the cubicles have low walls, so you can see everyone at a glance.  This was an interesting opinion. 
 
So, what is better, private cubicles, a room filled with desks and no dividers, or completely separate rooms?  If it is up to me, I like a separate room, but if I am managing others, I like to be able to hear them faintly in the distance, so if they are telling a client the wrong thing, I can run in and intervene — but I get relative peace and quiet simultaneously.  In the real world, my perfect environment is not so easy.
 
Are there studies that discuss the advantages of office set ups?  I am reading on Wikipedia that having a bunch of people working together in the same large room is called an “Open Plan”, and contributes to higher noise, higher turnover, and stress.  I can relate to that.
 
I’m reading another blog called The Good Work Circle that claims  that many larger companies are getting rid of cubicles and adopting an open workspace office set up.  The open workspace model was better for communiation and a sense of community. 
 
I like the idea of a hybrid system for BPO companies, where you get your private space and quiet part of the day, but can have togetherness during other parts of the day. 
 
Another factor is how cool the building is that you are working in.  A really pleasant work environment for BPO companies might have high ceilings, art work, a pool table, a pleasant break room, and places to interact with others. If rooms are too small or efficient, then it might not be so pleasant to be in them.  A good balance between space efficiency and coolness might win the game in the long run.  It is good to not overlook the fact that many people just don’t care about how cool the building is while others who are more tuned it will really notice and just not want to hang around if the work environment is not up to their standards for coolness!
 
Since every group of employees is different, rather that reading a book written by an “expert”, why not listen to YOUR employees and see what they say about what they think a good layout would be!  That way you please the people who you are stuck with, and can make the best out of it.  And remember, BPO companies in India have a high turnover rate, so if you can make your employees lives better, the will stay around longer!