I also like the AER amps that C-flat recommended, they give a very good sound which I prefer to the more vaunted Trace Elliott. The Marshall acoustic guitar amplifier also has a good reputation.

As for mikes, I'd second the SM58 (vocal) and SM57 (instrumental)suggestions. These are more or less the "industry standard" though of course you can pay much more.

Another possibility is a mini-PA system. I've seen some very nice examples giving up to 4 or 5 channels and about 200W wit a smaller overall size than a decent combo, one such example is made by Dynacord.

Best regards,

mooman