So nothing above Excel Saga.... well that crosses out Rizelmine, FLCL, and Puni Puni Poemi among other things...
Well then, I will recommend the following:
Slayers is quite hularious. It is also pretty popular, so if you haven't seen it, it will be easy to find.
Yu Yu Hakusho is funny, it has mostly action, but there are things in that show that make me crack up.... unfortunatly if you watched it on cartoon network, alot of those funny parts were cencored.
Flame of Recca is, again, mostly action, but it has alot more comic relief than most action shows. I would reccommend the manga tho. the anime is shorter and doesn't have as much flavor as the manga.
Jubei-chan is also quite funny, but it is easier to apreciate the jokes if you have some understanding of japanese language.
Air Master is mostly comedy with action relief, it takes a pretty good sence of humor to realize that the 99.9% of the entire show is a joke.
Saiyuki is awsome, but unfortunately, it is hard to find the original series. T_T