After Bitmixer closed up shop, the mixer that has increased their market share the most is ChipMixer. They are reputable and well-liked. I think their unique system using identical output sizes (with integrated on-site betting) could be very effective at retaining full privacy versus other mixers. You can see their ANN thread here: https://bitcointalk.org/index.php?topic=1935098.0

There is also a new mixer service called PrivCoin. They are paying for reviews (and reimbursing mixing fees) in the Services section. People are reporting that they are being paid out. https://bitcointalk.org/index.php?topic=2185832.0;all