I have no experience with Rain Song, but I do have some experience with a very similar brand- CA, or Composite Acoustic. They were made in my home town, Lafayette, LA, and I was negotiating to be a rep- that never happened, but I was involved with the company, and did play several CA's. "Steady as she goes" would be how I would describe them- darn near immune to climate and humidity changes, and quite temp. stable, too. I have some fond memories of hangin' at the facility in downtown Lafayette, rubbing elbows with their indorsing artist and chowing down on some good cajun food- then heading to Festival Acadian. Poo-Yie, chere'!
CA went out of business a couple of years ago, and was picked back up by Peavey. I don't know if they are in production, again, yet.
You might consider CA, as well as Rain Song. Either will perform like you have heard, I would think.