dude im on that too, I would get sn Shure SM 57 FOR SURE! U will need it for micing a cab for guitar anyways.
The GLS- ES 57 are Replicas of the SM 57 u can get 3 for liek 80 bucks, but i dont know... i rather buy a used SM 57. I dont think the GLS es 57 will sound near as good as an sm 57...