stg83: I certainly meant in terms of mood and themes as well, a few more examples are Full Metal Alchemist, Ghost in the Shell, Gungrave, Black Lagoon, Hellsing Ultimate and Darker then Black as the sort of animes I was referring to. Twelve Kingdoms is definitely another one on my to watch list and I know its really great. Regarding Thundercats it is unfortunately too late and we all know those "bring it back" online petitions never make any difference.
Hell yeah! You're my kind of anime fan. I'd put all of those with the exception of Full Metal Alchemist, in my top 5 animes. I'd put Baccano! in place of FMA.