I've seen these around, they always make me think "knockoff."
OP: Why not make yours an A2000HD, or A2500?
Yeah, it does kinda look amateurish compared to the later badges... maybe they were trying to deempahasize the "Commodore" name in those later ones. ;-) I evened out the grey background, but the actual badge has some kind of sparklely texture in it, looks like it was applied over the printing. Don't know how you'd replicate that in the real world. ;-)
I think I'd just design my own with simply "Amiga" on it, maybe a boing... but I'm not a purist. ;-) Probably the biggest problem I'd have would be printing it to scale. I don't have a color printer, so I would go to the local drug store and use their instant photo printer... they aren't very consistant ;-)