@vishal: you're asking for answers on something that depends heavily on your
personal preference and needs. you
have the best idea about how things are placed in your room, airflow etc. just go with the way that suits you the best. trial and error is the best way.
since you'll be the one looking at it, no one else can judge it's stylishness.
you could set your case on the top of your desk, set two speakers on each side of the display (one will be between the case and the monitor) and set the subwoofer under the desk. you could also set your case at the bottom, make sure it's easily reachable.
there could be many other combinations.