Not sure if this will help, but I'm considering the following cameras. I've thrown in some specs for quick reference. Thought it might help in advising which is better.
ASI174MM - C - 2.35MP, 5.86um pixel size, 78% QE, 32ke Full well, 6e read noise.
ASI183MM -C - 20.1MP, 2.4um Pixels, 84% QE, 15ke Full well, 1.6e@30db gain read noise.
ASI 294MC PRO - 11.7MP, 4.63um Pixels, 63.7k Full well, 1.2e @ 39db gain Read noise
ASI1600MM PRO - 16MP, 3.8um Pixels, 20k Full well, 1.2e @ 30db gain Read noise.