I LOVE Hershey's Black Magic 
It's on their website.
Super moist!
This never fails me.
Double Chocolate Layer Cake
http://www.epicurious.com/recipes/food/views/Double-Chocolate-Layer-Cake-101275
I made this...
http://cakecentral.com/recipes/blue-ribbon-moist-and-fudgey-chocolate-cake/
and frosted it with Buttercream Dream.
DELISH!
and with 124 votes this one scored 9.8/10
http://cakecentral.com/recipes/dark-chocolate-cake/
I LOVE Hershey's Black Magic
It's on their website. Super moist!
Ditto. This is one of the best chocolate cakes I have ever tasted. However, it is not dense enough to do a lot of carving with. I actually made it for my son's groom's cake and everyone loved it. It is not super sweet and it is one I will continue to use again and again.
Black Magic (with changes) is my basic bakery cake. I have others with finer chocolate, but the prices are higher. This is also the one I use for charity events because it is a crowd pleaser. I like my others better, but they taste more unique, not just chocolate cake (Stout, fine chocolate, and Guittard Dutch Process).
If you are looking for a wow factor, the chocolate and the method will need to be more on a gourmet line. There is where you get the, "I've never tasted chocolate cake like this before...", comments.
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