The Monolith M1060 is on sale on monoprice.com right now for $197. They are normally $299. These are a pair of great sounding headphones with plenty of bass. I would highly recommend these if you're willing to spend that much. The sale will end soon, so act quick. Regarding HD6XX, I would still choose the HD58X for $50 less because it has basically the same sound signature but with a little more bass extension.