Sounds like you might be a good candidate for the Grados. I'd try the SR225i. I liked the Q701s for their smooth mids and highs and big soundstage, but find the more forward mids of the Grados better for all kinds of rock. More engaging. They will also be easy to drive with your Xonar and any portable media player of phone that you have.
You might also be the kind of person that needs to use your budget for two sets of headphones. Many people with wide musical genre tastes find that no one headphone does it all for them.