I was at Gryphon once looking at their acoustics and the owner handed me a guitar & said:
"this is the only Martin you'll need". It was a Martin 000-28. Although I didn't listen to him, I have since played them & he might of been right...a great 000! Elderly has them custom made & offers them at a reasonable price.
000-28H
Martin's 000-16Gt is long-scale (25.4"), unlike a true Triple 000 which is 24.9".