I usually use a pair of Sennheiser HD280s that I've had for over a decade. I've used some fancier headphones costing more than an order of magnitude more, from brands such as ZMF. After experiencing the high-end advantage, I'm still perfectly happy with the 280s. There are a few things I care about in a monitor, and DPI is nowhere on the list. Every monitor commercially available has more resolution than I care about. My number one concern is consistency across a wide viewing angle. Low latency, retina DPI, gamut accuracy, HDR, curved surface? I don't care about any of them. I have tried all of them.