Just for timely information, did a search of homes available in Green Valley Ranch from $00 to $200,000, there were over 100 homes available that have at least 3 bedr 2 baths with Garage for 2 cars and at least 1,000 sq ft. In Green Valley Ranch you would have a lot of choices for homes.
However keeping in mind about schools for your 2 year old son, Green Valley Ranch is serviced by Denver Public School System.
There are other areas about the same price range that you can also look that give you choice of school systems for your son. Parts of Aurora are in the Cherry Creek School system and in Aurora Public Schools.
Even in Parker there are some homes available in the price range I mentioned and Parker is in the Douglas County School system.
In the southern Denver metro area Douglas County Schools and Cherry Creek Schools are considered by most buyers and home owners to be very decent school systems.
If you are looking for Community events, Low crime rate and decent schools, you will need a variety of information sources to help you make a decision you will be happy with for the next 5 to 7 years since your son is now 2 years old.
This really is a situation where you will want to talk with people you know in the area you have an interest in, as well as websites and Realtors to give you a better picture of the areas you might be interested in.
Yes there are tons of sites so if it helps here is another one it is http://www.city-data.com
This site provides a wealth of information, almost too much. It's a great site to start that info search.
If you need help regarding specifics of areas or interpret information, feel free to contact me through email or phone at my website.