I'm gonna take a look at Gintama, at the same time I'm watching Toriko, Persona 4, Fate Zero, HxH Remake and Fairy Tail
I'll pick one more series to watch at the same time.
My choices are:
Ao No Exorcist
One Piece, but is so long that I prefer to wait until FZ and P4 are finished
Saint Seiya the Lost Canvas, only if the anime is complete
Digimon Xross Wars
Kenichi's strongest disciple
Guilty Crown, I have watched three episodes and I'll say that is mid level only.
At the same time I'll be reading a manga, the time I usually spend on anime per day is from 2 to 5 episodes at most 10. And I want to enjoy at full my vacation, so I cannot watch all those at the same time
So I'll ask the public a suggestion. Consider that I prefer good plot over just shonenly violence