First, if you are looking for the "true" Ramirez 1A sound, there is really only one way to go. A real vintage Ramirez from the 60-80s. With that said you have a few options.
1. Ibanez Andorra 2850 (the one with rosewood back and sides) - An all laminate, but high quality, guitar. Not a true Ramirez 1A copy by any means, but inspired of it and a nice guitar on its own.
2. Masaru Matano/Cervantes - Made true copies of the 1A with scale from 662-650 mm. These guitars are from the late 60s to the early 80s. The earlier (usually) the better and they are named "Clase" depending on year and woods/decorations. A Clase 250 from the 1969 could be equal or even better than a Clase 800 from the 80s.
3. Kazuo Yairi - Many different guitars, from student models to high end. Keep an eye open for the 70s YC-models. The higher the better. I have the top model YC-250, that is very nice Ramirez 1A copy, strong voice and great sustain. Stay away from anything below YC-100, to be on the safe side.
4. Ryoji Matsuoka - Almost always good guitars from the 70s and 80s. Also inspired by the 1A, but often with normal scale of 650-655 mm. The Matsuoka's from the 70s is usually a great buy and higher number means "better" guitar, but the same applies here as for the Matano/Cervantes guitars. An early low number model could be better than a higher later one. They are not quite as bright as the guitars mentioned above, but usually have a warmer, fuller, more midrange type sound.
Common for all the Japanese copies I tried is that they don't have quite the deep voice and round trebles that only a real 1A has. However, many prefer the sounds of these guitars more than the original. With this said, they could be great instruments anyway and you could always experiment with strings.
Regarding scale I would care too much about it. I played good sounding 660s and bad sounding, and easy playing and hard playing. Scale doesn't matter much in my opinion, the same goes for woods - Indian or Brazilian doesn't matter much. Spruce or cedar is just a matter of taste.
It's not uncommon that these old Japanese guitars comes with a thick layer of lacquer and many times they wake up with a total re-polish. Good luck with the hunt.
All the best from Sweden
1977 - Kuniharu Nobe No.15
1997 - Dragan Musulin
2004 - Alain Raifort Grand Concert
2007 - Curt Claus Voigt Torres
Feel free to ask me anything about Japanese classical guitars.