There are several posts concerning this, but they aren't exactly the same. The 24/7 and Milleniums have different grips. I have read on here that there is no expectation for Taurus to supercede the Milleniums with the 24/7s. As for the caliber offerings, I am pretty sure Compacts are available in all that you have mentioned.
Where would I find the model number or nomenclature for the 24/7 Pro Compact versions?
I'd like very much to standardize my weapons around the same frame. It's either going to be the 24/7 Pro/Millenium Pro pistols from Taurus, or Tanfoglio's offerings. I'm building up to a service pistol and concealment model in each of 9, 40, and 45 calibers.