Bret Halford
500+ Head-Fier
I currently own an Amiron and 1990 and I listen to a ton of metal and some rock - I agree completely with @DW75 's very nice comparison.Thanks, have to say I've read your post a few times now and is probably the most useful comparison I've read so far.
And its the one that makes me think the 1990 with the passive filter might be 'just right' for me.
Another Beyer to consider:
Particularly if you want a more linear transition from bass into mids, the Beyer 900 pro x would be worth checking out. It tapers down after 6k as well, so it should be a bit more palatable up high as high. The Stellar drivers at least on this newest pro pair (700/900) is tuned quite differently from the Teslas, particularly in upper treble and mid bass. I like them both myself, but the Stellars might be just the ticket for you.