Since Maruko-chan can't participate in the contest due to absence of subbed episodes, there are no other masterpieces, and among others I favor Armitage III
Again no masterpieces. As of decent ones, I'd say that Taiho Shichau zo is the one I enjoyed the most even though it's just franchise setup with 4 episode OVA .
Don't know how to put it... but I gave away the first genius masterpiece score to Gunnm already. There's also one firm masterpiece Kyou kara Ore wa!! .
I failed to find something really good in Summer 1992 season, Kurenai no Buta is the best title among the decent ones, but I still don't consider it a masterpiece.
Yokoyama Mitsuteru Sangokushi is not as spectacular as Sangokushi movies, but I was interested in learning the roots of the story so much that I enjoyed it substantially nevertheless.
I can highlight two borderline masterpieces - Osu!! Karate-bu and Chibi Maruko-chan Movie with original work always taking precedence over recurring one of equal score.
First of all, with 100 titles after filtering this is getting totally unreadable, so from 1990 I'm moving to coverage per season rather than per year. In 1989 there were quite a few surprises for me as I could call as many as five titles borderline masterpieces Venus Senki , Hoshi Neko Fullhouse , Majo no Takkyuubin , Tezuka Osamu Monogatari: Boku wa Son Gokuu , Assemble Insert with first one turning my personal favorite from this list.