Hey all, I'm pretty new to the forums, and am trying to decide on what my next set of cans should be. My current daily drivers are a pair of secondhand Grado SR-225's (not E, not I, just 225.) I enjoy the sound out of them, amping with a Schiit Fulla 2. I also have a pair of Audio Technica M50x's, but those mostly collect dust these days. (Bass is too muddy, and the cable broke. It's an easy thing to fix, I just haven't gotten around to getting a new cable because I like the Grados more.) I typically listen to relatively modern, guitar based music - some heavier (Baroness, Torche), some not so much (Karate, Jason Molina), most of it independently produced - as well as film/game scores. I also like Scott Walker a lot, whatever "genre" he falls into, and will take music recommendations from anyone willing to entertain my annoying ass in conversation. The headphones will likely be used for some video games, but getting a "gaming" headset is far from my focus here. All of my listening is done at my computer. I'm looking for something with more/better soundstage/imaging and separation than the Grados, and so am trying to choose between the following: -Sennheiser HD6xx - "it's better on tubes" I get it, but still. -Hifiman HE4xx - seems like an affordable, good entry into planars. -Hifiman Sundara - but, is it better enough to just skip the 4xx? I know these three models are fairly popular and written about often, but this is an expensive hobby, so I'd like to get something that I can be comfortable/satisfied with for the next year or so before I get the upgrade itch again. Does anyone with experience with some combination of these headphones have a suggestion they'd like to share? Have I just been chasing a hype train and not realizing it? Am I channeling a bunch of beginner energy and you, an experienced audiophile, just want to shoot this kind of nonsense down? I'm here for it. Thanks in advance.