It's been a while since I lived in Dallas, but Village Station was always where we were 2-3 times a week. It's enormous with 2 floors, a huge dance floor, a two-level outside patio, the rose room for drag shows, and it was always the best time.
The Round Up is a sight to behold! Boys Two-Stepping in their starched jeans and hats. It's a must-see.
JR's is at one end of the strip of clubs anchored by the Village Station and has the absolutely most adorable preppy/frat/boy next door types you've ever seen in one spot. I do think it's become the main hot spot.
Naturally, Sue Ellens is at the other end of the strip, and caters to a much more masculine crowd, the ladies.
For one night, you'll keep yourself very busy at all of these places all on Cedar Springs just off of Oak Lawn Avenue.
There was another cluster of bars off of Central Expressway, and every Tuesday night was the strongest drinks in town at the Crew's Inn (The drinks were AMAZINGLY strong). I beleive there's nothing much happening there any night but Tuesday.
I highly recommend the Melrose hotel for those of you planning future trips to Dallas as it is right at the corner of Cedar Springs and Oak Lawn and you can walk to everything on the strip. It had a seedy past (I'm quite certain I remember running down the halls naked long ago

), but they have really turned it in someplace charming and fun.
I agree about Cafe Brazil for Sunday Brunch, and you have to grab a burger at Hunky's for me! TMC used to have a Sunday afternoon tea-dance with food, but I never made it up that early on Sunday
Final bit of advice for going out in Dallas. You can't be too ready to go out. We ironed everything, including our T-Shirts before going out, and even then, we kept checking in the mirror to make sure nothing had gone awry.
The city has an incredibly self-conscious vibe, and you can go out in casual attire, but it should be a contrived casual that's clear you worked at it. (Hey! I'm just giving the facts here, I know my hometown)
If you see Jasper at JR's tell him Rob sends a huge kiss!