You need to determine: How much (and what) you plan on carrying. What kind of ops (mounted/getting in and out of a vehicle, on foot, stationary, near water/quick-release,etc)? Soft armor underneath-such as IIIA? 3-gun/range training? Law Enforcement?
You have several options. Jeff probably has some plate carriers. Try him first. If he doesn't, or you don't see what fits your needs, go to "Grey Group Training". They'll set you up.