Plugin technology continues to amaze me. Acoustic guitar is one that I have never heard done well. Until today.

Check out this video on this virtual instrument - the player's technique is very well suited to it since he knows how to play the keyboard in a guitar like fashion, but even so the sound it incredibly convincing, in my opinion.

https://www.youtube.com/watch?v=xrEM448PxAE

Here's the plugin. http://www.amplesound.net/en/purchase.asp it's not cheap, $170 for just one model of guitar, but this is the closest I've ever heard and listening to the Youtube without watching definitely sounds realistic.

With BIAB midi generated acoustic guitar tracks, I'm guessing most folks could get really nice results from this plugin and fool most people very well.