Yo Qurupeke, since most of those shows are pretty damn good and you can't really make a 'right' decision why not do the cool option you've got and watch the first episode of all of them (or all that are feasible) and then continue with the one that intrigued you the most for the moment. That's not supposed to say much about the quality of any one show but rather a fun way to go about it.
Nah, I think this will confuse me the most. I'll watch them all anyway so it's not really a hard choice. I have to say that the walls of spoilers for Samurai Flamenco intrigue me though, I think I'll cheat a bit and watch it before Penguindrum.