I'm a big fan of North Mianus. You will be hard pressed to find a better family community. Lots of people don't realize the history of the area. If you drive around you'll see lots of street names to go along with the 1950s construction, such as Nimitz Place, Marshall Street and Watch Tower Lane. You guessed it, this area of North Mianus was built up after World War II. Many realtors try marketing their listings in this area as being part of "Riverside" or "Old Greenwich", which technically they are and stay away from using the term North Mianus. I'm not sure why they do this as there is an obvious difference between North Mianus and lower Riverside and Old Greenwich. It's not like your client won't notice and will start bidding as if they were buying something on the water in Old Greenwich.
There is no reason to fear North Mianus. Your dollar can go far here as you will end up putting more of your money towards the house as opposed to land. You can buy into this area well under the $1 million mark or spend more and purchase a fantastic house that would command a higher premium in lower Old Greenwich or Riverside. The reason for this price difference is simple. Lower Old Greenwich and Riverside are closer to the water, the town of Old Greenwich and have generally larger homes on the properties. North Mianus, being built up after World War II, consists of many smaller and simpler homes. Over the past 5 or so years we have seen much construction in North Mianus as these homes are built out. For this reason you can find some fantastic entry houses ($700-900k range) or newer construction for more. North Mianus does have a fantastic location as it is just second from the post road and minutes from Old Greenwich and Stamford.
I spent a ton of time on my website putting together information about the town of Greenwich and all of the areas within it. I thought you all might like to see what I came up with for the different areas within Greenwich.