I'm also one who loves the bitter... I actually prefer limes over other citrus for this reason, and really love the peel muddled into a drink to get that bitter hit.
For coffees I stick to the big and bold flavors of local cuban espresso beans.
Black and rich and beautiful.
Husband otoh really sweetens the crap out of his coffee!
If I accidentally grab his cup not looking I choke and spit... gahhh.
And I can't tell you how many times he's asked me if I was going to brew a pot and then not had a cup at all... just because he likes the smell in the house.