Welcome to the area. As many have already said, Dallas is a huge area and personally I would steer clear of Dallas ISD.
We are in Plano and the school system is very good. If you choose this area, go to the PISD.edu site to look at the best schools that might fit your needs. There are many highly rated schools in our district (I'd be happy to give you as much hands on info as I have for the programs I know about and have worked with). I have been a substitute over 10 yrs and the support programs are top notch.
Of course, go to greatschools.com to get your own research on all the school systems in the area. You might find another area to fit your needs better.
Traffic can be a nightmare anywhere in the DFW area. From our location, we are about 1/2 hr from downtown and inside an hour from Love Field and DFW airport. We love our area.
We run our company from home but we have warehousing in South Dallas, Arlington and Houston. We've never run into major traffic issues other than the normal peak times of day or bad accident somewhere.
I believe you can find a good fit for your family in the DFW area. PM is you have an specific questions about Plano. We love it!