Diamond iX3 may be fine, but they appear to have an upper foot guard not needed if you buy the NB 450 plate shoes. A shin guard without that extra top foot guard would work better.
An alternative to paying big money for the WV Platinum is below:
Amazon.com: Champion Sports Umpire Chest Protector: Sports & Outdoors
Use the size that befits the height of the umpire.
