nothing too exotic, but I have a 70's Fender nylon string and also a Washburn...which has more bottom end.... Paid $150 for each at different times... also have an old Harmony which came with steel strings and a warped neck.. the label inside says "Do Not Use Steel Strings"...now it makes a great slide...it cost $10.. aim a Royers Ribbon mic at any of them and they're great in studio...

Roger Miller played nylon string...