Several folks I know, myself included, use a Fender Acoustisonic Jr. amp. It sounds good, has all the features I need, and doesn't cost a bundle. I use a separate PA for vocals, but have tried out singing through the second channel on the amp and wouldn't hesitate to use it for vocals in a pinch.

If I were a rich man, I'd prefer a California Blonde or its "little sister" the Strawberry Blonde". They are superb acoustic amps. I just don't play out enough to justify the extra expense.

For mikes, you just can't go wrong with a Shure SM-58 for vocals/fiddle and an SM-57 if you want or need to mike a guitar, banjo etc.

Happy Hunting/Shopping

Bruce