I would suggest a whole house surge suppressor in your main panel. (uses 2 spaces). Secondly, one or two dedicated 20Amp circuits to the site of your equipment stack. Third, I have used rockwool insulation in several recent remodeling projects. It comes in flat panels and batts. It has thermal insulation, fire resistance, water resistance, and sound dampening all-in-one. Usually available at HD and Lowes, but sometimes can be special ordered in larger quantities for a better price. Consider using rockwool above (between the joists) to lessen the sound bleed through to the rest of the house.
A basement can have heating issues, water leakage, flooding, musty smells, etc. Make sure that deal with all that as best you during your remodel. best of luck.