I do recommend you go with at least commercial grade, tamper resistant outlets. Super expensive at around $5 each. :-) After a long period of time CG outlets will still grip tight. Tamper proof is required in residences and keeps kids from starting a fire with paper clips. Above all, avoid rhodium plated outlets if you go all in on even more expensive outlets.
The sub panel is really pretty useful in making it cheap to have multiple circuits in one room. You can run an oversized 220V wiring to your listening room and then take individual circuits from there. Also, you can put an in-panel surge protector at both your main and the sub panel. This is often preferable, both cost and math wise to running large individual circuits all the way from your main panel to your listening room.