A lot of the cheap ICW plates are level IV ICW. Some of the most expensive plates out there are level III ICW or special threat ICW. Depending on the vest there may be any kind of size plate pockets from 5x7 on bigger, but they usually are 10x12 or smaller and rarely are SAPI sized. Honestly in my experience spending a lot of money one one rig and using it for a lot of diffrent things, teaching beginners, training, doing competitive stuff in armor, has led me to building several rigs. Being operator like that gets expensive, if i was going to do it again I would have built one more scaleable system. Look at a carrier like the velocity LPAAC which conceals well with just soft armor. Then get a good chest rig like a mayflower or Haley strategic or spiritus systems. Then get plates. That way you can go from everything from just the soft armor under a shirt for teaching a pistol class to just a chest rig in its own harness for when you train to the combined system with all three parts for SHTF. Make sure to pick up a good battle belt along the way and maybe a helmet. Radios and nods are cool but you need your pouches and PPE first. I'm pretty young, most of the guys I hang around with want to have the most Gucci everything and they buy things as soon as money hits their bank account. I've seen tencate 6400s, really fucking expensive plates, sit in a closet because the owner didn't have a carrier yet. As long as all the equipment is "good enough" gear and you know how to use it you will kick the hell out of the guy with stuff that was so expensive he couldn't afford ammo.