Will this be used for LE or Civvy only? What will the capability of the plates be and what do you plan on using the plates for? AS scenarios/entries or SHTF/Home security? Mission drives the gear so knowing your intended uses is key to selecting wht you need.
It really will be dependent on what you plan on using it all for. Will you need to consider discrete wear of the plates in any way? Most LE functions, the answer is no. If you don't need to look at hiding plates under a shirt or something, don't worry about a concealable plate carrier. It's going to be too much a PITA to put on concealable armor, put on plate carrier, then put on the Blackhawk Tac Vest. Too many layers to worry about.
Personally, I'd consider looking along the lines of something like the Mayflower Assault Carrier and see if it fits your needs. I've been doing research into it for a similar need for my dept. Keep the Tacvest for something light where rifle threats are known to not be present or training.