Here in the US, Sigmas are pretty available used. I got my first and current 52SDR-7 rosewood git new in the latter 70's, and it has aged beautifully. Its action and neck yield no ground to any Martin I have plunked on (not to say I wouldn't want one), and after setting it up with Grover tuners and bone nut and saddle, I'm set to keep it as my go-to guitar. I've recently acquired a Sigma DM-2 in mahogany (build nation not stated on soundhole label or otherwise marked), which needed truss-rod adjustment, re-hydration, a bit of fret tweaking, and nut replacement, and it now has great attributes, though mid and upper fret action a bit higher than on the DR-7. I got crazed and worked the soundhole to Martin's D-28 Clarence White edition specs (plus pickguard mod) and it really cranks out volume! Next guitar? Don't know, but I am mighty impressed with the 1970's vintage K. Suzuki guitars out of Nagoya, Japan.