As Stephen (Puma Cat) says, the mirror method works really well and will give you the locations that "must be" treated. Most acoustics guru's also say that you can add too much absorption, but you can't add in too much diffusion, so if you have any "budget" left over - add some diffusors. Diffusion instead of absorption behind the speakers (front wall) is generally a good idea, and diffusion at other points around the room can be helpful as well. I see that Stephen is using diffusion enhanced absorption devices - good call!!!! If budget becomes an issue I've found that hitting the ceiling and back wall reflection points with inexpensive high density polyester absorption panels (cheap at amazon.com) are surprisingly effective and can be attached using those removable 3M mounting strips. Those can also be cut in half (at a 45 degree angle) to make triangles that can be mounted as "flags" to the wall/ceiling interface which cuts down on flutter and "splash".
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