http://www.dallaspooldemolition.com/ did ours. We had our pool completely removed and then filled in.
Something you may want to consider if you plan on selling. Your value will go down if you don't completely remove it. They don't sub it out like a pool company may. They have all the heavy equipment needed to get the job done. It was a little over 6000 to get ours completely removed, filled, graded, and fence put back up and we could't be happier.
Well we could have if the pool repair co. hadn't ruined our pool making it necessary to demolish it.LOL btw. they wanted 4k more than dallas to demolish it and they said they would only charge us cost because you know...yeah right
good luck