I recently tried to file the nut and the bridge of my acoustic guitar. I forgot that you can easily remove the plastic bridge saddle that the strings rest on near the sound hole. This was a big mistake and I now need to buy a new saddle peice. Just a friendly FYI. My guitar does sound and play much better than it did before. I agree with the other gentlemen who said buy cheap and fix up. That's what I do now and have a great sounding and playing guitar to show for it. GUITAR BUYING TIPS: If you are buying a used guitar look at fret wear, neck alignment, action, electonics, and sound most importantly. Fret work is the most expensive while action is the lower end of the set-up. I had my the frets dressed on a brand new guitar because it was buzzing high on the scale. The guitar was a cheap one and not dressed from the factory. This would cost about $70 depending on where you go for service. Refretting can costs about $150 if your lucky. The bridge peices are relatively cheap compared this. So look for good frets.