well the fullbring arc is meh, the current quincy arc has little buildup and would just be another drawn out battle scene in the anime. I enjoy bleach, but I don't want them to continue because it may just be completely filler.
Yes, I think they should do some more work with High School of the Dead. It just left us wondering what next after their great escape.
I think Count Cain and Bride of the Water God should be animated. Both are technically historical, but I can also see some beautiful art work coming from them. Especially BoWG. They should also make a second season for Skip Beat since they left off in the middle of the Dark Moon saga. I wanted to scream when I hit that point. The manga has advanced far enough to do it.