Coffee cake

I started thinking about coffee cake three days ago, and, of course, I became obsessed and had to make one. After looking at a bazillion recipes, I settled on this one. I'm happy with it, but it won't be my go-to recipe. But don't think that makes it bad: it's really good, I'm just looking for something with a little more 'punch.'
(As always, my changes in ital)

Sour Cream Coffee Cake
use real butter

Streusel topping:
1/2 cup brown sugar
2 tbsp flour
2 tsp cinnamon
2 tbsp butter, softened
1/4 cup chopped walnuts

Cake:
1/2 cup butter, softened
2 eggs
1 tsp vanilla extract
1 cup sugar
1 cup sour cream (1 cup Greek-style yogurt)
2 cups flour
1/2 tsp baking soda
1 tsp baking powder

Preheat oven to 350F. Mix the streusel ingredients well and set aside. Cake: Cream butter and sugar together. Beat in eggs and vanilla. Mix in sour cream. Sift together flour, baking powder, baking soda and add to the wet mix. Beat until just combined. Spread half of the batter into a greased and floured pan. Sprinkle 3/4 of the streusel mix over the batter and then pour the rest of the batter into the pan. Top the cake with the remaining streusel. Bake at 350F for 45 minutes or until a toothpick comes out clean or with moist crumbs.

I also made a powdered sugar glaze to pour on top. Whisk together 1 cup of powdered sugar and about 3 tablespoons of milk.