Everything you need for the room - http://www.acoustics101.com/
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Rives has three levels of help to choose from. You can get as much or as little help as you like and, IMO, the price of their service is very reasonable. They also have room simulator on their site which could be helpful in getting you started. I believe you room dimensions are pretty good for acoustics.
Hmmm. Interesting - the link I suggested doesn't go where it's supposed to.
OK - Do this - go to www.auralex.com, then click on acoustic university 101. Everything you need regarding setting up the room / construction including walls, floors, ceiling, windows, HVAC etc at no charge.
And - it's for starving musicians, not well heeled audiophiles - send a description of your room and they'll suggest treatment schemes and lots of cool pictures -again for free - try it, you'll like it.
I also suggest that you invest some money via Rives audio. I went to them with a very similar project (basement room of similar dimensions and also with concrete walls), and the results after implementation of Richard's plans, are very satisfying. Be aware that the plans are only the initial investment. We were remodeling so we had some flexibility as to how we approached the suggested program. The probable suggestions will not be inexpensive (as in 'off-the-rack'), but then it just depends on how far you want to carry things and how much you actually want to integrate the acoustic features into the room vs. adding them on.