When you get to around $ 500 or higher , I ' d look at only used guitars that are comprised of all solid woods solid wood top , back and sides , NO laminate ' wood '. Also make sure that the nut and bridge saddle aren ' t plastic . As for body shape , I ' d recommend a dreadnought or grand auditorium . There are a lot of uniquely great acoustics out there , so play a lot of them and go with what feels right . Don ' t get too caught up in who makes it . Also check any used guitar for cracks and a ' belly ' below the bridge . Avoid those . <| sep |> I ' m sorry the pic didn ' t come out well , but I can clarify what ' s on it if anyone has questions on it . On the bright side though , I was able to get my voltage down to 3 . 75 v after setting the clock speed to 4 . 0 then back to 4 . 7 , I ' ll run another stress test on it tonight . Hopefully temperatures will be down and won ' t fail the test .