I just posted this in another topic:
One thing to consider re the stereo: the Bose system was designed for low power consumption, and if you go to a powerful aftermarket system, you may want to upgrade the accessory battery to an AGM or at least a higher capacity "marine" or "hybrid" type, just to avoid dead batteries. If not, at least be sure to always use the accessories in "Ready" mode, not the battery-killing Accessory mode.
As for the Bose system, make sure that if you test one you adjust the audio settings from the car's central touchscreen menu. The default settings are weak on Bass, but it's available.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.