Frisco/Allen/Plano/McKinney/Fairview are all really good areas to raise a family if you are interested in North Dallas. Good schools, safe neighborhoods for the most part. Every town has its less desirable areas but just do a little research and you will be fine. Particularly Fairview, if you can afford it, with the Lovejoy school district, is considered to be a primo place to raise and school young ones right now. Lots of young families there. Allen is enjoying high football achievements and has a "small town" feel to it still. Sandwiched as it is, there is a limit to how much it can grow. Plano is much bigger than it used to be but the schools are still considered some of the best in the state. Frisco is still growing and I personally hate hate hate driving there. The traffic is awful. They are working hard on it, but right now the roads don't seem able to keep up with the volume of people very well and driving in Frisco is always stressful to me. That being said, they have lovely neighborhoods and like all communities in this area have very reputable schools. The entire area is saturated in family friendly activities, restaurants, entertainment venues (Frisco Rough Riders, Allen Event Center with its hockey and football teams along with concerts and other events), Plano Community Theater and tons more.
Medical City is owned by HCA. HCA also owns all the Medical Center of ______ (insert suburb name here). I work for one of these and am very very happy in my job. Is it perfect? No. But it is good and I have no plans to move somewhere else anytime soon. Other areas hospitals are the Baylor owned facilities, which tend to pay less but have high nurse satisfaction (Baylor Frisco is considered a primo place to work), THR (Presbyterian hospitals) which vary in quality and nurse satisfaction (Presby Allen has a poor reputation but Presby Plano is considered to be good as is Presby Dallas). There are the new Forest Park hospitals, one in Dallas and one in Frisco, which are considered awesome places to work. Those hospitals are doctor owned, have good benefits and high employee satisfaction ratings with brand new everything and well equiped.
Most of the local hospitals are strongly prefering BSN candidates these days but ASNs with pertinent experience are still getting hired.