Steak in Texas sucks by comparison to Midwest steaks. There's a reason that BBQ originated in TX and that's because the meat was so tough that they had to marinate it in something to soften it up.
CBD Provisions (1530 Main St) in the Hotel Joul is really good!
Wolfgang Puck's 560 at the top of Reunion Tower is actually good food and a good sushi bar in there too. It rotates so you get a great view of the city.
Dee Lincoln's Burger Bar is good (Dee is the original founder of Del Frisco's Steak House).
The Lower Greenville area has a lot of choices as does the McKinney Avenue area.
Babb's is good, but there are a couple other good BBQ joints too. We go to Babb's a lot just to support Chris' family and get updates on him. But the Pecan Lodge is great, as is the Slow Bone and Sonny Bryans.
There are a lot of trendy little joints that are great, but I'd recommend skipping the chains like Salt Grass and Texas Land & Cattle as they aren't much better than Chilis.