I need help with Sound Isolation to keep it quiet for the wife / baby

I have ripped off the drywall to my master bedroom. Of the four walls, three share the outside of the house and the fourth shares a wall with my great room / movie room. The old drywall had wall paper directly on the wall boards with no prime in between so it is easier just to rip off and redo. During the redo stage, I am planning on using insulation sonobatts in between the walls. However, I don't think this will be enough to keep it quiet in the bedroom when the wife goes to bed early. We are also planning on placing a crib in this room for the baby to sleep while we still entertain in the great room, so sound proofing is a necessity.

I am not considering green glue / double drywall, stagger studs or an extra wall due to space constraints. What other options are out there that you guys have used that are reasonable and work fairly well. Note the Studs are wood.

I have read about the asphalt type matting that can be applied under the drywall, would this suffice and if so where is a good place to get it.

I am considering a MDF type heavier door with a gasket around the door and blocking at the bottom.

I am also looking at something under the carpet to aid in sound blocking from below the floor.

Any help would be greatly appreciated.

Thanks for the responses guys. The room is 12x15. Where is the best place to find GG. I think that you guys have talked me into it. I am still concerned about the floor as in the future the movie room will be somewhat below the bedroom. I am looking to tackle this now as the basement is only 7.5 feet tall so I am limited down there. Always planning for the future and tackling one project at a time and hopefully doing it right.

Thanks for the responses guys, the wheels are certainly turning in the head now. What should I seal the electrical boxes with, just basic caulking or other?

Also, i noted on the greenglue website they also sell some accoustical caulking, in addition to the green glue should i use this to seal off the first and second layer of drywall at the top and bottom? They also sell joist tape, would this help to put on the studs to aid in de-coupling?

I have R11 or R13 sonobatts insulation, got it for free, so that is definitely going in. Thanks again guys. Will take pictures as things progress. FYI, the MFW15 (no problems ever : ), I consider myself lucky) is on the other side of the wall, just trying to tame it a bit.