I take a Rainsong; carbon fibre guitar, immensely strong, impervious to changes in temperature, humidity etc. If it gets wet, you just wipe it. If it gets scratched, you rub it with T-Cut and then some Autoglym car polish. Very light weight, as it has no truss rod, body bracing or head/tail blocks. People who play it are usually determined to hate it,as it isn't exactly traditional looking, but come away impressed with the acoustic tone and volume. Good electrics too. My more expensive wooden guitars stay at home these days. I also hear that Peter Mix of Rigel Mandolins (now defunct) is selling carbon fibre mandolins...hmmm...
Tim