HD650
a planar you prefer
maybe a closed back ?
I got vastly more enjoyment from the original Yamaha HP-1 Planar Magnetic headphones in 1978 than I had with the Hifiman Sundara
They seemed much wider and more open than Sundara's
I got them for free when I bought a top end cassette deck (I think they normally sold for $100)
Sundara is likely much better spec-wise but was not as enjoyable (going from memory - or more of a memory of the feeling I had)
The later versions of Yamaha's Planar headphones did not impress as much and the quality control seamed to slip in later revisions
(YH-1 and YH-3)
The only closed back planars I ever tried were the open backs with my hands cupped over the ears