I voted for Ultimas, but I'm not familiar with too many computer games.
As for Zork, isn't its gameplay similar to the 100+ digital comic/adventure/dating games already on PCE? I'm guessing that Return to Zork for PC-FX doesn't require a keyboard. Wouldn't straight ports of Ultima require text input? No matter what, even if faithful non-upgraded ports are what some people have in mind, I'm guessing that some sort of compromising will have to be made.
Ultima 1, 2 and 3 can be done with no text input, and as it stands, Ultima IV, V, VI, and VII were all ported to NES/SNES and had no text input required. They simplified the communication for console releases.
Ultima 3 and 4 for NES are pretty awesome ports of the game. They got the Dragon Quest treatment to them. They are worth the time.
Doesn't Wolfenstein 3D for SNES run without any special chips? A perfect port might not be possible for PCE, but a custom version should be possible for any hardware. It just depends on how much needs to be altered vs how worthwhile the endcresult would be. The Genesis did a decent job pulling off a few real time fps games.
Yeah Wolfenstein doesn't require special hardware. It would be fairly doable on the PCE. Look at faceball. It's practically Faceball. I'd say it's doable ,but highly ambitious/time consuming.
Now wait just a minute! I LOVE Commander Keen! It's one of my favorite DOS game series! However, Keen is easily playable through DOSBox, and easily downloadable from almost every old game website.
The Gold Box games, are a little more hard to play, especially when you consider that they require a lot of pack-in materials that came with the game to play, much less appreciate them. I think that there is a lot that could be done to update them.
BTW, how hard would it be to make it so that if you beat Pools of Radiance for PCE, that it would save a file to memory that could be read by Curse of the Azure Bonds for PCE to import your characters?
It would be perfectly doable. The games share an engine anyways, and have identical character data. That's why you can just use a character disk for Curse, that you used in Pool.
That would be an interesting setup