Power questions

Hello all.

New enthusiast here.  My question is about source power for my equipment. Im redoing the wall that my equipment is on. I use it for 2 channel and movies. Purpose is to increase distance between my left and right speakers and to get a larger tv. As an electrician, when i origionally roughed the wall I knew enough to pull a dedicated cct for the "entertainment system".  I never envisioned getting sucked down this worm hole. So...being that the wall is open i can easily pull another dedicated circuit. Perhaps #10 awg. So i would have 2 dedicated 20 amp ccts on the wall and a 15amp general purpose cct.  My equipment is as follows: Anthem mrx740 avr, Anthem 325mkII amp, Paradigm Founders 120H left and rights which have active woofers , a node streamer, and a Rell wireless module.  Behind the wall is the router for the house(stair case wall).  The amp powers my lcr speakers. The avr powers my surrounds. Questions are:

1. Would another cct make sense?

2.  How would equipment be best devided between the ccts? (I know this should probably be obvious but amuse me please)

3. Would pulling a dedicated neutral be better than sharing  a neutral as far as noise reduction?

4. Isolated Ground outlets?

Thanks for any input