I'm not sure if its still like this or not but in the 90s there was a huge difference in tone between the SJ-100, SJ-150, and SJ-200 even though each were sitka spruce and maple. Looking you could say it was cosmetics only but I'm fairly certain that Gibson spent more time on the bracing of the more expensive models to make them sound quite a bit better. The SJ-200s were far more responsive and lively sounding than all of the other more affordable models.
Later on the custom shop variants really meant that someone with a bit more seasoned skilled hands spent more time and selected better materials to build the CS instruments than the standard.
I've been fortunate to own and play a lot of the different CS varian models over the years both SJ-200 Elites, Customs, True Vintage and even the latest Historic models.
All that being said the best one I've played is my clean all original 1949 Gibson SJ-200.
Good luck in the hunt. For a killer looking rhythm instrument that does everything well a good SJ-200 is tough to beat!