I use mainly a stock Yanagisawa HR 5 on my new Chinese nino and Conn nino (1925) and it sounds very mellow, plays in tune and handles well on both. I bought it second hand so it may be an older one. I've also tried Selmer pieces (I bought one of your older Sop Planet Selmer pieces Michael) and a new Selmer C* (which worked well on a 1923 Buescher nino I used to have); and Vandoren. The Vandoren is good, voices well (comes in one tip size only, not sure what it is equivalent to). I've also tried a Sax Gourmet metal and various Chinese and Taiwan pieces all of which need refacing really to complare to the others (the Sax Gourmet has promise, it voices well and goes up the top end very easily, but I've been struggling with it on my horns so don't play it any more, maybe I got unlucky with the facing, they are very sensitive). Overall for mellow/dark I'd go for a Yani HR piece (not tried the metal) or for something with more power and brighter a Vandoren (although they are expensive), that's certainly the classical choice, with Selmer.