has anyone heard these or know anything about them? Closed, Dynamic Acoustic Principle Circumaural Design Principle 14-24k Hz Frequency Response 2 x 300 Ohms Nominal Impedance > 93 dB Sound Pressure Level Continuous power rating - 100 mW Average pressure on ears ~ 3 N...

i've got senn 580's and a nad c521bee. now i need an amp. the lowest price i have found for the MKII is 329 shipped. the ppa is like 410. which would best work with the setup? sorry for this redundant post, i'm a newb to this part of the audio world, so please forgive me