I have already given you a very good desciption of both models above like you asked before, maybe you missed my post.
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It's not that the MS2i is for mellower music, it just is not as fast and punchy and tight as the 325is, the MS2i is just a mellower headphone itself, The 325is an attack to it, it's much more aggressive in my personal experience with the both of them, which is what I preferred. Sounds like you may like the 325is for their aggression also.
What's "heavy stuff?"
I've owned the 325is for just over two months. Except for a few live jazz recordings, I still like the sound better than my HD-650 or (Beyerdynaimc) DT 990 or T 70.
Oh. You mean Steppenwolf and Black Sabbath. They're great.
Grado's are great for heavy and fast music in general. I still love my RS-2(not a huge step up from but still a step up from the 325is) and listen to them often.
Putting time on my RS-2(semi? vintage) right now; really good for rock and metal. The Sword and Queens of the Stone Age are just god tier on these. But yeah the RS-2 and 325is really aren't worlds apart; it was mainly a vanity thing that I bought them over the 325is. Also if you ever want better sound with the same signature look into the synphone magnum mods. Something I might add; they don't really need an amp, I find they sound a little cleaner out of one; maybe its placebo but it seems like they get better transient response when properly powered. BUT coloring the sound with an amp is something I like as songs with sibilant mastering becomes very apparent. I would suggest listing to them and if you find them sibilant trying a slight EQ on the upper mids and highs.