Elric is the new version of 'Stormbringer', and yeah, I think it's the same as 'Eternal champion' because it's Michael Morcock's. Actually it's the one I like best, though five rings is quite good too.
Big D, in 5 rings you're a samurai in something like the Middle Ages. It's played with d10, more or less the system is basically like vampires. You've got a number of dice you throw for each characteristic, then you keep the number of dice equal to the number you've got in each ring. For example, you've got the ring of fire, air, earth, water and hollow. Hollow is basically for doing magic and for adding dice to throw. Then air is a combination of the characteristics reflexes and inteligence(not sure about this, I think those don't go together, but you get the idea). That rings number is equal to the highest of it's two characteristics, and that's the number of dice you keep. I don't know if that was clear

Hope you got the idea
Actually, I really like 5 rings, it's great, because then you've got a clan(do you say it like this in English??) and depending on your clan you've got a school where you learn all you know and each school has different techniques.