None of my Encores are longer than 26 inch barrels, with most at 24 inches. That being said, because there is not an action to add length these guns are short by nature.
I think either the 26 or 28 will work well.
I never owned a Weather Shield yet.. Notice that the shorter the barrel you better have a good sling.. They tend to swing down on ya when your carrying them... I have some shorter than 24 incher..I do like the 24 incher but I think I would go with a 26/28 in the magnum calibers.. Notice you already own yours.. I truly enjoy using the Encores for fox, coyotes, and chucks.. I even have killed deer running with my only shot too.. So they just fit right no matter what barrel you use..