Aji Panca and Chocolate Bhut Jolokia are both very good!!
C. chinense "Brown Egg" is pretty boring. It tastes like a bell pepper will a little heat. It looked pretty cool when you cut it up though. Mine was red inside.
i have only tried one chocolate variety choc hab, best tasting habanero, and i have tried quite a few habs I asked a similar question a wile back but it was about chocolate superhots from what i gathered,, This year i whent with choc bhut jolokia, im also growing seeds from the choc habs i tryed and got black stingers wich is supose to be a darker smaller more productive choc hab variety, i say if you already like a sertain type of chili you cant go wrong with the choc version, i got 3 varietys going right now, pick a few and go for it,