As many of you may have interpreted from my last thread, I was very confused about my impulsive headphone buy. That is why I feel as if I should "start from scratch." I need advice for headphones around $250, and $300 if the difference is completely worth it. I want the best price/performance...

I ordered my DT990 (600 ohm) off Amazon rather impulsively while trying to decide between other headphones. I would appreciate some other recommendations that are better than the 990's. Amplification is not a problem, I am using a Xonar Essence to power the 990's. Very few people may claim it...