good short animes

[jaxc]

as the title suggest, i've been pretty busy lately(mostly with the new job) and aside Toonami on Saturday nights, haven't really had the time to enjoy any good anime. So because of this(and a few other reasons) i'm on the look out for short but sweet anime(between 12-13 episodes giver or take) and to avoid recommendations I've already seen and to give an idea what i tend to gravitate to, I will give a list of shows i have already seen:
FLCL
paranoia agent
serial experiments Lain
Madoka magica
deadman wonderland
and i'm constantly trying to catch up on Hellsing ultimate
any other recommendations will be appreciated, please and thank you!