If you don't mind me asking, why are you selling your PM-3's? Just curious as I was just about to get some.
Was a comfort rather than sound thing for me they hurt the top of my head, kept them for just under four months as I did enjoy them other than the comfort issue, thought they may bed in but alas no. That and needed to claw a bit cash back after buying some new Audeze LCD 2s ironic really considering how heavy those are but there not going anywhere.
Well worth a look don't let me put you off your purchase.
You didn't mention how you'll be listening but I am auditioning PM3 and Audeze Sine + Cipher with iPhone and Tidal as portable source, and Yamaha reference AVR for home audio source. Here is my experience so far. I find the PM3s so, so much more comfy than Sine. Because the Sine has the Cipher lightning cable with built in DAC that overrides iPhone DAC, I bought a dragonfly red USB DAC and Apple CCK that I tried with PM3s. The thought was "apples to apples" in terms of external extra DAC "oomph". I can say the dragonfly is definitely being returned. For me personally the extra hardware is too frankensteinish and with DFR you lose headphone volume & track control. I'm not exactly winning any popularity contest in the DFR forum.
I find the PM3s very, very comfy right out of the box and I wear glasses. They sound almost, but not quite as good as Sine for portable use. Using my home reference Yamaha AVR, the PM3s shine brighter than Sine. And... I am struggling to feel half the same comfort with Sine but I think lighting cable connection is the future if iPhone 7 rumors are true, no more 3.5mm headphone jack.
My ears are sore from demo-Ing the new gear.... but it's a toss up for me right now.
Then there is cost to think about and I'm thinking about it. A lot.
FYI you can get a pair of refurb PM3s from Oppo for $319. Oppo even shipped UPS instead of FedEx ground because UPS is more secure and offers flexible drop-off points for me in NYC. I bought refurb PM3 and if I didn't know I'd swear was brand new. Gorgeous presentation box, super nice hard carry case with zipper. Same 30 day return/audition period, same warranty. So if they don't feel good, you can return them.
Sine is almost $550 with tax in NY. No hard case, just carry bag made of cloth.
Choices, choices....good luck!