Well, the first thing you have to keep in mind is that the XD-53 are a custom version (differently tuned drivers) of the ATH-PRO700 (the model prior to the ATH-PRO700MK2), and while they certainly are quite loud, actually louder than most headphones I've seen so far, they aren't that detailed, and they do have some bass roll-off, although less than the original Audio Technica model.
It's a shame you can't stretch your budget enough to get the Pioneer HDJ-2000, those would be quite nice, but I do find the Ultrasone DJ1 a good alternative to them, and within your specified budget.


















