Is spending $1200 on a GL2 going to be a good investment for you? It depends how far you intend to go with it. For all intents and purposes, it's a dated camera at this point. You've got cameras that do 24p or HD, or in some cases both. If you intend to use this for anything professional, or grow into professional with it -- this isn't the camera, and you'd be better off saving up a little more for something higher end. If this is just for learning, it'll do the trick.
I generally consider any piece of technology good for 2 years. By then, either you've outgrown it, or it's been usurped. Buy the camera if you think its price is a worthy investment for the next 2 years of your filmmaking development.