The Sennheiser Momentum has come up a few times in the thread, and although I lack the experience to say it's one of the best closed 'phones in your price range, I really like mine and I think they're definitely worth a look if your ears are small-to-average sized (70mm or less, I'd say).
They isolate admirably for a portable headphone, and won't require you to amp them in order to sound great. Yes, they have a detachable cable, although it's fiddly, as it is a 2.5mm jack up top and there's a locking mechanism unique to that connector, meaning your aftermarket cable options are limited at the moment. I listen mostly to EDM and jazz, and they sound great to me.
I think they'll perform quite well for your genres, although given your music's more intense nature, I might also recommend you V-Moda's M-100, which has been receiving some serious praise on head-fi too. For your tastes: metal, techno and hardcore, I'd probably go with the M-100, which also has a detachable cable and will do without an amp/DAC. I also think they look cool, but that's just personal preference :)
In Australia, you should be able to find the Momentums at JB Hi-Fi. For the M-100s, you might have to look overseas. I believe both are worthy contenders on your short-list, although sadly I have never heard the Z1000 or the 702. Good luck!