Because you have a great deal of diversity as to where in the 'Plex you need to be, there are a raft of choices.
If you want all of the amenities a big airport provides, at very reasonable prices, Dallas Executive (formerly, "Redbird") is a great choice; all manner of approaches, two runways, reasonable hangar rates and even tolerably cheap gas. (KRBD)
Clay mentions Rockwall, a great airfield.
Mesquite Metro (KHQZ) is very user-friendly, has ILS and every other approach, cheap-azz-gas.
Arlington ain't bad, but with the new Cowboy stadium and other area developments, I definitely look for it to get more costly as time goes by.
If you can be a little more specific as to where daily life will have you, we can be a little more specific with our recommendations, including how both ground and air traffic might play into the mix.
/s/ Spike