Chris,
I would like to add that you can easily control the color and width of the border along with the color of the fill using the GeoPen and GeoBrush classes of the AreaStyle as you see in the code below. You can see here that I control the color playing with the RGB values to have the style as you can see in the screenshot. Now, I don't know how you have your features (territories) changing color. You could write a function passing a color and that darkens it for the border. With Map Suite, you have full flexibity for styling as you can see in those few samples of the Code Community.
wiki.thinkgeo.com/wiki/Map_Suite_We...es_Samples
GeoPen geoPen = new GeoPen(GeoColor.FromArgb(255,0,255,0),2);
GeoSolidBrush geoSolidBrush = new GeoSolidBrush(GeoColor.FromArgb(255, 138, 255, 138));
AreaStyle areaStyle = new AreaStyle(geoPen, geoSolidBrush);
worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = areaStyle;
worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;