No need for aggressiveness. Allow me to address the original question:
Rather than just firing off whatever amp or manufacturer one likes, we need to ask more questions. First, for what headphones? If for newish model headphones that cost around the same, it's pretty hard to make a bad choice. What you are using as a source may make more difference in my experience. Is it going to sit on a desk at home or would some degree of portability be useful?