I will use the cans with a Fiio E10 on my PC. I listen mainly to Metal, Rock and instrumental soundtracks (video games, movies, Anime). My budget is about the same as I paid for the DT 990s: $200 (or 145€) give or take.
As far as sound goes, I was content with the DT 990s, although the treble definitely was harsh at times and the bass slightly rumbly instead of punchy. So if there's a DT 990 with SLIGHTLY less bass and treble energy, it'd be perfect. However, consider I live in Germany and it's very important to me, that replacement parts or at least earpads are readily available.
I already tried the ATH M50s, their tonal balance was nice, but they really sounded congested and "in your head". Soundstage = zero.
Another pair of cans I had were the Creative Aurvana Live, really good, but a tad too dark and muddy in the low end.
The Superlux 681s are still in my posesseion (using them as backup right now) and they're a bit hollow.
Edited by SSSN - 7/6/14 at 2:54pm