Check out Street Fighter: the RPG. It requires a battle mat to keep track of where people are, but there are a variety of moves each of which has pluses and minuses. Everyone picks their action and you count up from 0. When your initiative comes up you have to declare your action. Basically, you can use faster attacks to interrupt slower ones. There are lots of special moves you can learn and it's an interesting system. Balance is maybe a bit off, and it does not cover weapons well at all. It's worth looting for ideas though.