-Ghost in the Shell 1995 is one of my favourite animes (it's a movie though)
-Appleseed 1988, another movie based on the manga from the same author as Ghost in the Shell. It was alright
-Shonan Junai Gumi, aka young Onizuka, and not nearly as famous as GTO it would seem.
-KyÅ Kara Ore Wa!!, another delinquent anime from the 90s
-Initial D first stage, released in 98 but the whole thing screams 90s (mainly due to the soundtrack)
-Berserk, late 90s
-Dragon Ball, haven't watched DBZ actually.
Other than that I'm planning on watching Golgo 13 if it's any good. There's just something about these old animes that really appeal to me, maybe it's because I grew up with the general art style of 90s anime, or because I like the cheese.
Oh yeah and I just remembered I grew up watching Tanoshii Moomin Ikka. It's mainly aimed at children. Most of you probably haven't heard of it but it was big in my country since the author was partly from here. Localised voice acting, but one of the best dubs I know of, they put a lot of effort into it.