That's not what I'm saying at all. I've never listened to a Grado, so I wouldn't be qualified to judge it.
It's not that the HD600 mids are too forward, it's that the overall signature is a tad too laid back to give justice to the genres that call for aggression. I have my iems when I want to rock out.
If you're not totally opposed to in-ears, I'd like to suggest the Vsonic GR07 Bass Edition. I listen to a good bit of rock and metal, and it does justice to those genres unlike anything else I've heard. Drums and guitars are astounding on it, and the crunch of the distortion guitar sounds like it's being amped by the IEM's diaphragm. Also, it has great bass. I've yet to hear it sound bad with any single genre. Give it a try. You an get a pair for about $150, but it compares well with other in ears costing up to $1,000.
http://www.head-fi.org/t/572175/vsonic-gr07-perfection-added-mkii-vs-bass-edition-24-03