I have two 12-strings, a maple Guild jumbo, and an all mahogany Martin J12-15. Two totally different creatures. The Guild has a big jangly sound with more overtones than should be allowed by law. The Martin has a smaller body and a much crisper and more precise sound. I recommend either, depending on what sound you're looking for. Used non-vintage Guilds can usually be found for about $1,000 USD. The Martin J12-15 sells for about $850 new, which should equate to around $600 used.