Ressentiment (being scanlated by Kotonoha) would be a fantastic anime if done properly and aimed at adults (say 30+), not teens.
Also, I would really like it if Narutaru (Shadow Star) by Kitoh Mohiro would receive a proper treatment.
A complete rendition of BLAME (Tsutomu Nihei) would be eye-popping good, if done well.
I would definitely watch Pluto, by Urasawa. And when it's done, Soil (Kotonoha's doing that as well) would also make for a swell anime.