I've had all three Boss models, of those I prefer the CS-2...it has a warm tonal character (the CS-1 is too squashy for me, and the CS-3 just not as warm).
I've also had the Ibanez CP9 and an a couple old MXR Dynacomps (block logo). The CP9 is nice, but I found it to change the fequency resp too much for my taste...kind of a mid hump like the TS9. The old MXRs a nice to, fairly squashy and milky smooth.
I'm actually down to the CS-2 and, are you ready for this, the DOD Milk Box. Clean, clear, flexible, and cheap. Other than that I may try one of the custom models from Analog Man or Keeley.