I just completed a media room and work with people who had done recording studios. I found all of the professional acoustical companies to be grossly overpriced. PBB and others are essentially in line with my application. Double drywall with offsetting seams is a must. On the walls I would consider using a 1/4 to 1/2 inch exterior sheet insulating material from celotex in between the studs and glued in place. I would blow in your insulation with a mastic so that it provides solid coverage. On the floor consider two layers of subfloor with 1/2 to 1/2 cork in between the layers glued. Or cork on concret then subfloor.
Use a fibrous commercial pad under your carpet. I would go with a drywall ceiling the acoustic tiles aren't going to do what you want. I would run furing strips perpendicular to the joists about 8" apart and glue rubber strips to the furing strips. Put two layers of the drywall on this. The rubber strips will provide separation of the ceiling from the joists and floor above. Finally before doing all of the above get elastic concrete filler in the caulking tube and caulk everwhere wood meets wood or floor.
Use a fibrous commercial pad under your carpet. I would go with a drywall ceiling the acoustic tiles aren't going to do what you want. I would run furing strips perpendicular to the joists about 8" apart and glue rubber strips to the furing strips. Put two layers of the drywall on this. The rubber strips will provide separation of the ceiling from the joists and floor above. Finally before doing all of the above get elastic concrete filler in the caulking tube and caulk everwhere wood meets wood or floor.