the master of gj. to be honest, there aren't really any other commendable gj artists... except maybe django's main partner, stefan grapelli
Gypsy Jazz is pretty cool, but don't get too hooked cause Django is one of the only real Gypsy Jazz masters so it's a pretty limited subgenre. Have you listened to his songs like "Brazil?" He wasn't like anyone else. He really took music seriously and influenced a lot of people.