I'm in the market for my first 12 fret guitar. I tried a Martin 0015s and liked it--it was 1 3/4 at the nut, I think. However, I'm interested in a couple Recording King 12 fret guitars? ROS 16 and ROS 626. I've played their low end 14 freters and found them quite playable. And finally, is it common for most 12 fret guitars to measure 1 13/16th?