I'm 5'8 at 154 pds. I've looked at ShellBack Tact Carrier and Banshee Armor Plate Carrier and Diamond Back FAPC Soft plate. But can not figure out what plate size? Is the plate size universal so that a 10" x !2" fits all carriers? What plate size for my size? Any recommendations. Prefer more budget minded purchase because this is for deferred use in case of SHTF? Any place in Portland to buy at reasonable prices. Thanks.