What are the best Room Accustic Treaments members have found?

GIK Acoustics by far offer the most effective and best value.

Also great advice.

There is also ATS acoustics in Piper City Illinois. Can purchase factory made or DIY.

GIK Acoustics

Agree! Call them. Send them photos. They will help prioritize what it is best for your situation - biggest bang for your bucks. Very good, scientifically-based products, very good value, and excellent customer service. 

GIK Acoustics is a good company offering the traditional approach to room acoustic treatment. This approach to me, makes the room look like a listening room or recording studio.
 
As my room functions primarily as a family - living room I use the Synergistic Research approach of using a group of resonators attached to the walls. These are small and do not distract from the décor of the room. In addition to being highly effective, they are easily moved to work with a change in room layout or music equipment. Being removable they can also be used in future listening rooms. Maximum flexibility, excellent acoustic effect and minimum visual distraction.
David Pritchard