Cowboy Bebop is perfect as it is, anything more would ruin it...
A FMP sequel is a must tho, they didn't really end it right...
Peace Maker Kurogane too (I wonder if Kenshin will appear? lol j/k)
Candidate for Goddess needs to finish up (but I think they ran out of money)
and ofcourse, the original Tenchi Muyo (I KNOW they didn't run out of money, maybe ideas, they made Tenchi Universe and some other crappy spinoffs, but I'd rather see the original)