Assuming quality of the tone is not an issue. Is there an acoustic perhaps made of synthetic materials that will be less prone to warp or crack? I'd like to get a beater guitar to leave at my in-laws house so I don't have to carry mine back and forth. The thing is that they live a block from the beach and it's super humid in the summer and very dry in the winter due to their forced air heat system. So a swing of 75 RH to 20 RH is entirely possible. I'm not there often enough to monitor the humidity. Are there any cheap acoustics that might not warp as easily? I could care less how good it sounds. I just want to be able to practice while I'm there. My back up plan is just a beater guitar with those humidity packs in the case and hope that I can keep up with the changes.