Well I do not really know about 1/2 prince, as I saw it tagged as gender bender...not to hot for questionable sexual orientation, lol more of a traditiioal romance guy myself.
As for Yureka, let me congratulate you on reading it: its a good one!
Taking Yureka, I recommend the following (descending in popularity):
Fairy Tail (Must read if not already)
Demon king (2001, but still pretty kewl)
Ares (Korean Manhwa, but an Awesome read)
Soul Eater (anime around too)
The breaker (although not that many scanlations)
Kurokami (there's an anime too)
Hope it was of some worth, what ever you read, just have fun!