Abacus vs. Aurora
I think they are 2 completely different places. If you're all four serious foodies (with sturdy checkbooks) looking for a very upscale culinary experience, go for Aurora. If your more in for a good time with some pretty creative (and good) dishes, go for Abacus. And yea, Abacus'll will run you probably 30-40% less, at least. You could always split the difference and go to Fearings or Stephan Pyles.