If you're up for a long ride, Legend of the Galactic Heroes and Touch. Both are just over 100 episodes and are classics of their respective genres. Legend of the Galactic Heroes is a space opera, and Touch is romance/baseball (also one of the most treasured anime out there for Japan).
Also, Ideon (Mech), Macross: Do you remember love, Kimagure Orange Road (Romance), Record of Lodoss War OVA (Fantasy, early 90s), Project A-Ko, Rose of Versailles, Gundam 0080, Aim for the Top: Gunbuster
I'm open to all genres and series lengths, I'm just looking for what people consider the best really. I'm watching and enjoying a few Leiji Matsumoto series, Hokuto no Ken and Mobile Suit Gundam.
Hey, hope you enjoyed the gen con.
I see some models painted insanely well, far better than I could ever hope to do.
And you got the name right, that is a Hierodule. xD