Some popular phones in and around that price range are the aforementioned HD280s, AKG 240s, Sony v6 / 7506 (some Sonys are decent, most are awful for the money spent - model # means a lot - avoid the v600/v700 like the plague), and if you're willing to spend a bit more, the Beyerdynamic 770s. I've only heard the 280s, and I like their neutral sound; I want to hear things as close to the artist's intentions as possible, and if I want to color it that's what EQs are for imo. Many people, probably mostly those used to boomy bass, feel they're lacking in the lower end, though I listen to all genres but country and feel that's completely untrue. Beyers on the other hand are known for their bass. I've heard that V6s have muddy bass and shrill highs, and aren't worth their price; that they only look good in comparison to the v600s - but I admittedly hate Sony and so have probably only heard the bad about them while discarding the good from my memory

. I haven't heard much about the AKGs. Closed phones are less popular in the high-end market since open tend to sound better per dollar spent.
Grados are about as open as they get. Others will have no trouble discerning what you're listening to, and you'll have no problems hearing what's going on around you. They're known for being tailored to rock/metal and sounding great for it. While I haven't heard Grados, I will say that those genres seem to be the weak points of my beloved 280s. I recommended a pair of sr60s to a friend who listens mostly to metal and he adores them, fwiw.