I can advocate 2400 AD from your list. Great fun and accessible.
Probably the only Origin game I cleared on my own without a cluebook,
which is not to say it's easy.
Phantasie III is worth playing for its kinda ridiculous body parts
based combat system. You get messages like 'Frost Giant does 27 damage
to Helena's torso, removing it - she dies.' Also, limbs will be lopped
off your characters, and those limbs will disappear from their status
display graphic.
Wizards Crown, Eternal Dagger and Shards of Spring (you didn't mention
the last) are all related in that they go in for extreme
micromanagement. Like Roadwar 2000, I think all 3 offer 'fast combat'
options where you can let the computer slug out the whole battle
automatically. The lack of a middle ground made them painful to me.
I love Moebius: The Orb of Celestial Harmony, but it depends on
whether you mind the combat being arcadey. Combat is done side-on in
Karateka type sequences.
Likewise, The Immortal and Ancient Land of Ys like Mitchell pointed
out are killer IIGS games with killer scores, though again, actiony.
If you're interested in a text-based horror combat RPG, might I plug
my own 2010 game Leadlight -
http://leadlightgame.com
- Wade