Ultima 6 - FM Towns (Fujitsu) version with the UNZ emulator.
Easily the best version of the game IMO with full voice acting, nice graphics, etc:
[ Show youtube player ]
A must have version for Ultima RPG fans.
Works perfectly with the UNZ emulator:
http://members.at.infoseek.co.jp/townsemu/
There are some awesome games for the FM Towns computer system (Japanese).
I've also been playing Dungeon Master and Chaos Strikes Back (FM Towns versions) which are easily the best versions of the games with atmospheric, full audio soundtracks. These are in English as well.
Some awesome Wizardry games were also released with updated graphics, etc but seem to be only available in Japanese. Bummer