https://www.youtube.com/watch?v=yNWl63e5lZw I just found this video on youtube and this is pretty helpful to understand the difference between the sounds made by guitars made of different kind of woods. Its a 10 min video but it would definitely help everyone who want to buy a guitar.
useful video... actually I noticed that there was indeed some difference in the sound produced by different guitars shown by that guy in the video... but that is a small fragment of the original 2 hour video ... would be better if someone posts the full video...