Rick -- may I ask who the source of your numbers is? You say "a website", but there are many websites out there, and most of them are crap.
That said, the source I see cited most frequently in arguments like this is RJ Rummelt: "Death by Government". He has
his own webpage and thus cannot be trusted (see above). But while I wouldn't bet my first-born's life on his numbers if I had one, Rummelt's work does have the advantage of being peer-reviewed. His ranking is:
1) Soviet Communists (60 million)
2) Chinese Communists (35 million)
3) German Nazis. (20 million)
Unlike you, though, Rummelt isn't counting people killed in wars. Also note that there are many more Russians and Chinese around to be murdered than Germans. If democide was an equal-opportunity enterprise, I'm fairly sure Hitler would have killed the most people.