Definitely
Seirei no Moribito. It's got fantasy, alternate universe, fighting, inspiration, fantastic dialogue, unbelievably complex character work and a great plot.
As you liked School Rumble, I would also try
Natsu no Arashi, by the same author. It has some history, good dialogue and characters, and a even a little romance. It's fantastical elements are really more sci-fi than fantasy, but if you don't mind that I'd give it a watch.