After a very long hiatus of chasing the hifi tail I'm back into looking for a new headphone system or two. My first order of business is to find a simple system with relatively high audio quality for listening at the office. Since I will almost exclusively be listening to streaming via Tidal and Bandcamp (and perhaps Qobuz when it's available in the US) it makes the most sense to use my iPhone as the source (via cell, not wifi - I don't want to stream on our Guest network). I have an Audioquest Dragonfly Red that I plan to use. Ideally, I'd like to find a pair of IEMs that work well with the Red - any recommendations? I'm also open to full size headphones - however, I use a pair of Sony WH1000XM3 noise cancelling headphones for the bus commute, so I'm already carrying a pair of full size headphones in my backpack. The Sony's are fantastic for their purpose, but I'm sure I can improve on their sound quality in other contexts. Given my goal, and since it's been a while, I'm open to hearing of other options too, like DAPs, which I don't have experience with. I have a ton of music at home on an iMac, but I don't really carry audio files around anymore given the streaming options available today. Or recommendations for anything else that might pair with the iPhone as source, other than the Dragonfly Red (too bad I can't receive MQA streams over mobile). I'll also be looking for a system at home, where I'll up the "high end audio" ante. I'm looking at the Grace Design M900 as DAC/headphone amp since I'm familiar with Grace from many years ago. I still have a couple of headphones lying around, but I'll likely see what's new today. I may need closed back headphones so I can listen in bed at night. Thanks for any recommendations or guidance as I begin the journey anew into the rabbit hole of higher end audio.