The ASI120MM-S (and MC-S) has been released. It's the USB3.0 version of the 120MM/C. It offers higher frame rates but with the same chip.
ASI120MM-S/MC-S
It might be a little outside your budget, but, IMHO, worth getting as a planetary cam.
The stacking software is available separately - either AutoStakkert or Registax - both are free to download for private use.