I say at this point, that going without a car in Dallas is actually a viable option. Since my school gives me a free transit pass and since they are increasing my tuition to pay for the program, I use it whenever I can. I can say that DART service is "solidly mediocre". You have to plan your day carefully, and have to have patience, but it can be done. Last week I only drove 80 miles in my Miata (I drove to have lunch with my wife in Irving), the week before I only drove 2 miles (it rained and I had to drive to work), and this week I have driven 20 miles so far.