I'm currently making a conversion of Shadowrun. But I'm not sure that you'll be interested in it. The new system (Deadlands Classic if anyone's interested) isn't really rules-light. It's basically a more crunchy version of Savage Worlds, so if you think that's too crunchy, you probably aren't going to be interested in Deadlands. The main reason I'm converting it is because I'm really used to Deadlands Classic, and I'm not really interested in learning a new really crunchy setting like Shadowrun.