I'd like to suggest Gun Sword as an addition to the stream. While it was never on the original Toonami (or Cartoon Network, for that matter), I think it'll compliment the site really well. To put it into perspective, if you like Trigun and Cowboy Bebop, you're probably really going to like this show.
Here's a video containing the major fight scene from the first episode. Keep in mind that this is the first episode, before the show really started heating up: http://www.youtube.com/watch?v=9WChxcFgBk4
The show was written by Hideyuki Kurata, who also worked on R.O.D., the Hellsing OVA, and Excel Saga. It centers around a man by the name of Van, a wanderer searching for a man with a clawed right hand, who is the murderer of Van's fiance on his wedding day. The show has wonderful art, fantastic action, and great dubs, and if I recall correctly, got fairly rave reviews from Anime Insider and Newtype magazine when it first came out.
Let me know what you guys think!