The Maxwell Creek neighborhood in Murphy will be Wylie ISD and the Haggard Estates will be Plano ISD. I know that was one of your first questions - how do the school districts compare.
As you stated above, you will get more house for your money in Murphy (3200sf vs 2300sf). You will also find that a new construction home in Murphy will blend well with other homes in the area....as many of the nearby neighborhoods were built in recent years. However, in Plano you will find that homes surrounding the Haggard Estates neighborhood are older (built anywhere from 1970s-1990s) and your specific neighborhood will be the only "new" homes in the area.
Both builders have quality products. Both school districts are desirable (for different reasons). Both locations are great (easy access to highways, parks, schools, shopping, dining).
At the end of the day, the decision should be based on the best location and value for your family. My suggestion for someone buying new construction in this price point, is to make sure that you have someone on your side that is looking out for your best interests. Make sure you hire a Realtor to represent you and that will negotiate not only pricing, but also ensure that you have information about home inspections and more. This is a big investment - and you should protect it by having a professional assist you.
If you are not already working with another Realtor, pleaes feel freel to call/text/email me anytime. I would be happy to assist you and your family in finding the perfect new home.
Melissa Hailey - North Texas Top Team, Realtors
Coldwell Banker Jane Henry Realtors