So the long and short of it is that I'm searching for a headphone that will be very strong for my needs and a good all arounder.
I'm a flight paramedic and spend a lot of time on a turbo prop aircraft for which I like my Bose QC-15 with the Iphone can opener app to listen to music on dead legs. Otherwise I travel for education/training and prefer my IEMs for portability. I'm smitten with my TripleFi 10s and their accuracy, speed and relatively fun sound over being a neutral IEM. At home I have a Grado SR80i, Denon D2000, Fidelio X1 and recently bought my girlfriend a Momentum over ear which I use on occasion.
Again, I love the sound of the TF10s, the Grado is wonderful for hard rock and metal which I love. The Denon D2000s are my favorite headphone overall and do everything the X1 does but a little better with the exception of the feeling of space. I listen to a lot of hard rock and metal although my preference goes toward music like Tool, APC, Massive Attack, NIN, Lamb of God . I desire speed and detail... admittedly my hearing has suffered due to my job and years playing in hard rock and various other bands as a bassist. I consider myself a treble head vs. basshead. I don't like muddy booming bass and hate when it interferes with the frequencies that the bass occupies.
My search has come down to the HiFiMan He-500, Beyer DT880, Sennheiser HD600 and Grado RS1i. I've somewhat disqualified the HD600 as I believe they'd be a bit dark for me ( compared to my preferred Grado, TripleFi 10 Denon D2000 likings). Not sure about the Hi-Fi Man, I imagine the Beyer would be more of the same of what I already have but haven't heard them. I'm leaning toward the Grado RS1i but would really like a closed can if I decide to take it on the road. The Denon isn't the greatest for isolation.
Thank you in advance for your input