Soundproofing was #1 on my priority list.
Flanking noise is the single largest killer of soundproofing efforts; it can easily invalidate $10,000 worth of work.
Most sound is transmitted through doors, HVAC ducts, windows and light/electrical fixtures.
This is why my theater doesn't have any windows, nor HVAC ducts, nor light/electrical fixtures holes, and beefy doors.
Unfortunately those are also the hardest and most expensive areas to address.
Sounds like you need minimal soundproofing. You should concentrate on those areas first (if possible), otherwise just go with the thickest walls you feel comfortable with spending and call it a day.
Clips are expensive and very hard to do correctly, it's easy to mess them up.
Don't bother with channels unless you apply clips, and GG is a nice to have.
All three of those things are for studios or extreme cases.
How severe depends on who is listening to the "noise" and at what SPL/depth of the source noise is. The louder and deeper the sound, the harder it is to stop. Things such as: big trucks, dogs, trains, yard equipment, aircraft, factories/construction work, and subwoofers are the main violators.
I have ~45db of bass-proofing (DC to 200hz) and ~110db+ of treble-proofing (>200hz).
Resulting from a wall that is designed as follows:
Dual 1/2" OSB, 4" Stud with R20 insulation, 1" air gap, 4" Stud with SS, VB
, 1/2" hat channel, 3/8" soundboard, DDGG 5/8".
Note: I didn't use clips because it's a dedicated building.
Exterior volume is 4800cubes, Interior is 3000cubes.
Material cost was ~$5500 for that; about $1 a cube.
That's as good as one can expect from an above-ground/non-masonry structure.