Not sure if I've mentioned the guqin player Sou Si-tai, but was listening to his recent album "The Fisherman and the Woodcutter" last night and it is not to be missed by and guqin fan. He made his own instrument, and uses silk strings, and has a very old world, silent drift style that enhances the space and distance. Absolutely wonderful, with all kinds of clicky, cicada like microsounds going on in there.
And once again I would recommend the great Portland, OR, store Timbuktunes as the place to get it:
Sounds interesting. I prefer silk to metal strings on the gu zheng. Has a quieter, more subtle sound like a koto, as opposed to the thin twang of, say, a Vietnamese zither.