Ok i'm looking to get one of these lights for home defense, etc. I'm looking at the G2, the Z2, and the G2Z. The first is considerably less expensive, which means i could have a P61 lamp on it right away. Its also the lightest which would be a plus for carry. The others have better grips it seems, and would be easier to use with a handgun. If i went with the g2z or z2 would you suggest aluminum or nitrolon? Thanks.