CONSIDER YOUR QUAD OPTIONS
Ive attached a diagram of different types of quad possibilties. Obviously the first one is the desired one but sometimes you have to bite the bullet and go a different route. The second and third option work well in a manner of areas, obviously not overly desirable where deforming of the mesh is concerned but as I said sometime you gotta bite the bullet, and lastly the 5 sided poly, again not one for deforming areas (preferably) although it can be, but use sparingly, ideal for terminating edges when you dont want to add even more geometry.
Jay