I agree with Julie! I was going to suggest that buttercream, as well—but be sure not to refrigerate this buttercream, as it gets hard (like a chocolate bar) and does not become creamy again. However, it is an absolutely dream!!!!! So amazingly delicious!
My fave cake is the Perfect All American Chocolate Butter Cake (well, really the PAACB Torte on the next page, but I don’t always like to have leftover whites). It’s not too tender, but it’s not fudgy either. I find it the perfect layer cake texture.
I think the Spike that Julie recommends uses the Chocolate Fudge Cake—I haven’t made it, but I hear it’s wonderful, and it’s the fave chocolate cake of many here.