Hi, I'm starting an acoustic band with the intentions of doing some solid gigging, probably largely in small venues and coffeeshop-esque places. I will probably be looking to invest in a PA system for rehearsal and any shows that do not have their own sound, will not need to be tremendously loud.

What kind of wattage do you think I am looking for to play rooms with around 100 people or less?

I need to run 2 mikes, 2 guitars, a bass and possibly an electric drum kit. would a powered mixer and some speakers be my best option? if not, what type of system and any specific packages that suit my needs.

Also, somewhat off-topic, I am looking for a good acoustic pickup to put in my new guitar, nothing fancy just something that will not colour my sound, does anyone have any recommendations?