I have had Alice Bakery in North Wales make a number of birthday cakes. Check out their FB page for great photos of the cakes they make. I personally don't eat cake, but everyone raves about the quality and great taste.
Interestingly, I have always loved the cakes at Zakes. They are not overly sweet and have, to my taste, excellent texture, good flavors not muted by sweet icing. Definitely not your run of the mill birthday cake.