Hi, last time I was in Las Vegas I danced and took lessons at two studios. Dance Charisma is smaller but more popular, and Dance Elegance has a huge floor but fewer people. I took a lesson at each and danced at both of their parties. They're both within 10 minutes of the strip.
http://www.dancecharisma.com/
http://www.danceelegance.com/
Good luck,
Gary