update my selection: now I vote magicwallet.witness, verbaltech2, sahkan-bitshares and elmato.
as shown below, at the moment DEX price is 0.4157bitCNY, bitCNY has about 1.8% premium, a good feed price should be about 0.4157*1.018 = 0.423.
If an witness feed price which is 4%+ lower than such a price, I don't think he did a good job.
and elmato seems pay little focus on BTS now, he even feed MSSR=1.1 now, ignoring community consensus.