And Strong world is actually part of canon! Sadly Film Z has inconsistency with the manga (that I have heard), but I cannot wait to watch it just to see time skip character designs~
Also Dressrosa is soooo long! I applaud you Eich for waiting it out. Can't wait to get to it in the anime (looking at the pre-timeskip movies right now since we are at impel down), still waiting for stuff to happen in the manga....
As for "serious, no nonsense" anime, I do not recommend Samourai Champloo, it has its way goofy moments (still very good watch so do watch it anyway)
If you do not mind gory stuff (not too much but still there) I do like Ergo Proxy and a favorite "no-one-seems-to-know-about-it" is Boogiepop Phantom. Very special stuff in the last one, it's different. There is also Chrono Crusade, but its a little weird, don't remember if there's much comedy in it....
I'm a big fan of comedy in what I watch, if it gets too serious I lose interest (some exceptions). Might be way I would also say Death Note is good, but in the end of it I really preferred the first "season". So much more humor, less death-y.