I just bought a used Sigma DR 41 in mint condition with a hard shell case. It was a little tight, but I restrung it, took down the action on the saddle and nut and after playing it for a few days...it sounds wonderful. It's not as bassy as my new DCX1E. It's not as sweet as my 30 year old D 18, but it's somewhere between the two and very responsive.
It's far better than my Alvarez (which has a nice pickup and onboard tuning).

It's very light colored (like my D18 used to be) but if it sees more time out of the case, I bet it will get to be that same honey color.
It was relatively inexpensive for a solid top scalloped braced guitar and is a real pleasure to play.

I'm looking at another used Sigma tomorrow. For a small fraction of the cost of a Martin, the DR 41 has a large fraction of the feel and sound of a Martin. I don't know if they're all that nice, but I like having something I can enjoy playing without worrying about it as much as my higher end guitar...and it sounds good enough for acoustic gigs.