Colin:
As you know, Wayne Henderson's prices have absolutely nothing to do with the high quality of his instruments. He is one-of-a-kind and you are incredibly lucky to have one of his guitars at any price.
As for Indian Rosewood, it is a fine tonewood. My early 90's Taylor 810 (I.R.) sounds wonderful. A lot of the Brazilian you see these days is stump wood. It's very pretty and has lots of swirly grain, like cocobolo, but on the really good Brazilian the grain was tight and straight. That's very hard to find and, if found, VERY expensive ($2500-3000 just for the wood to make the back and sides is typical).
Bill, tgo