I can't stop pimping Heroquest. It is and has been my favorite RPG since it came out a few yearsback, and I've been doing this for a little while. Admitedly it's not for everyone- seems to be love or hate, and is really dependent on players and DMs being able to shift their D20 gears.
But it allows for the telling of heroic stories better then just about anything else out there, and really facilitates ROLE - play. (I know I know what does it matter what system you use- a good DM and players can do it with any rules, but thats a topic for another discussion)
After that I follow suit and recomend Castles and Crusades. This is not just a rehash AD&D nestoliga but a really inventive slick system.