My favorite so far has been esmokeyshack.com -- the flue-cured, and I just love (love!) his coffee one -- it has just a hint of dark chocolate taste to it, very smooth. I couldn't stand 2 of the 3 flavors that I got from Modernvapor.com (NO problems with the company though -- as they had great shipping times) ... I just found their coffee flavor to be dull, and the chocolate tastes like perfume to me. I did really like their cola one though. All those flavors were 24mg. I also was not too crazy about the 36mg Hilton I tried from Rockymountainvapor.com (once again, good company though -- great shipping times, and great response to one mechanical issue I had with equipment). I have found that both the coffee and Hilton that I don't care for straight are fine when mixed with my favorite coffee flavor. The chocolate it just a wash for me though -- as even a drop or two of it seems to just linger in my atty for hours, and makes everything else I vape taste like perfume.
Erised