Well, it depends on the style you wanna play. Definitely.
To me, nothing sound as good a pure accoustic guitar sound. And no Electric-Accoustic!!! NEVER EVER plug an accoustic guitar, even if it has the function to.
Here's why: when you listen to an accoustic guitar, you are listening to the sound that comes out of the hole. Same thing when mic'ed.
But when you use an accoustic guitar's preamp, it mics up the sound that is INSIDE that guitar. You're hearing the sound you would hear if you had your head INSIDE of the body of the guitar.... You don't wanna put your head in a guitar. Don't you?
Seriously, the best sound you can get from a guitar, is just in front of the bodyhole.
And to me, nothing sounds better than a 12-strings accoustic guitar. I have an Ovation and my band was sceptic ( a Trash/speed/prog band, with some accoustic part) to me to using a 12-strings. But now, they just can't wait for me to take my 12-strings out of his case.
It is harder to play at first, but it worth the pain!