Outdoors level is basically dance level indoors, unless you want that weedy "little village band playing outdoors" sound.
Plan for that and you should be ok for anything that comes along including the kickarse bass guitar rig but also adding keys etc.
In favour of sub, only need small tops instead of do it all tops. Most of the time everything cruises but if you need more they can really shout. Unleash the big dog up to 120hz.