Honestly I just use the HD650 something like 95% of the time. It's like mom's chicken noodle soup, or a pair of old fuzzy slippers, headphone comfort food that won't knock your socks off but is just pleasant and relaxing and nice, without doing much of anything wrong. These days, with so much crap going on in my life and outside of it, that's pretty much all I'm looking for most of the time. And the FR is damn near perfect.
Other headphones are the Stax L700, which has some faults but is just so damn musical, the Utopia, which sounds great but is a bit fatiguing so I might ditch it, and the SR-007. The latter won't fit my head properly, I more or less have to hold the earcups in place so it gets next to no use, but damn it sounds great when everything works out. If only Stax updated the ergonomics...
On the move I use the Westone UM Pro 50, for similar reasons to the HD650, though I do EQ it a bit. But then again I EQ everything.
Might get some RAALs at some point, but have concerns over brightness/fatigue.