I have not tried any other BT headphones besides these ones - I just have my Beyer DT990's to go off as a reference sound.  I may bring these into a Best Buy or something and try comparison tests using their collection of Bluetooth headphones and see how they stand up to some competition.

Have you tried out the Pendulumic Stance S1+?  I just got them and am listening to them but have not been able to connect them to an APTX enable source (just my Lumia 1520 which is awaiting a software update to enable APTX).  So far I think they are only OK compared to my amped Beyerdynamic...

In pounds: 44.6, 51.2, 60.3

Did you end up picking up said amps?   I'm going to buy the E9/E7 combo this week and have the 280's.  I've ordered some Brainwavz M1's and I'm guessing the clean signal from the amp/dac combo will sound good through those as well.  Much better than my static filled onboard sound card...

Or would I get the best quality of sound output for the money by just holding onto my cash and spending it on a nice amp?  Maybe the uDAC-2.

And I might as well throw the superlux hd-668 b in the mix, because I'm also considering them, too!  I wish I could throw them all in a cage fight of sound and see who emerges on top - I would go with that one.

Just to add another phone that I have been looking at as an option has been the Denon D1100's.  Any input on these options would be SWEET!  Thanx much.

Hey,   Just wondering with your knowledge of the SR850's and the HD 280's if it would be a worthy upgrade to go from the 280's (which I own) to the SR850's.  Since the 280's are the only decent HP that I own, it's hard to get a gauge for whether they are "good" or "bad," but there are lots...