For a small gig like that i would not mike the drums, just the vocals and any accoustic guitars. A few years ago i bought a small Kustom P/A system and have never regreted it. I paid less than $200 and it was the best investment i have made. Recently some close friends borrowed it for a wedding performance and it was rock solid. The Kustom model is no longer but it was a lot like this unit. http://www.guitarcenter.com/Phonic-Powerpod-410-S710-PA-System-630485-i1395799.gc. You could rent a small system for around $100 to $150 per day, but for a little more have a small portable system that if taken care of would last. I have gotten 8 years out of mine, and it has played to up to 200 people very comfortable


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