#1
I would like to get a good amp to play with my acoustic guitar, I will probably use a microphone instead of a pickup in the guitar, so what would you guys suggest?
#2
if you're doing gigs with it, better go with the pickup instead. if you're just practicing, it's kinda impractical to get an amp then just mic your guitar.

but to actually answer your question, any p.a. system will work fine