Without a doubt a mic'd setup is the way to go, but with that said it's a lot of work to get a good sound, the room your in, mic placement, the mic(s) you use etc will all affect your sound.
If you're just doing it for kicks (like I do) try out the DI route, It's wayyyyy easier to get a consistant sound. I assume you have an accoustic with a PU and depending on the mixer you might not need a DI box.