HiFiMan HE560 for $249 on Amazon. That is the most ridiculous value you could possibly find. I have a lot of planars, I find them to be better for most things than dynamics, and I can tell you, you cannot find anything better for 250 bucks. It's an outrageous deal.
https://www.amazon.com/Full-Size-Magnetic-Over-Ear-Headphones-Woodgrain/dp/B00K6JEYD4
That would certainly be an incredible deal...! I'm also seeing
Price: $595.55
Looking for some planar magnetics since i hear that their bass is usually superior.
Planars to me have a dynamic but more neutral take on everything.
That's why EQs exist! Btw imho, the biggest advantage in the bass of planars is actually the quality of the bass; the detail you can hear in the instruments, for instance; with planar almost be able to the drum body resonate while dynamic would be more like a 'blob'; mushy; blurry sound with no realistic detail. But they likely won't have 'more' bass (as in mid bass bump or just crazy boosted bass à la 990 or others), but they'll likely have better (flatter) bass
extension and just better quality bass. You can find a couple of posts arguing here of 400i vs dynamic headphones:
https://www.head-fi.org/threads/hif...-and-discussion.698974/page-816#post-13492713
Starting with something like the 4xx or even the 35X could give you a general idea of what planar sounds is about for not too much money.
The 4xx is closer to 400s, and from what I remember reading when looking 400i vs 400s was that the 400i was overall better; with a more solid bass. But, 170 for 4xx though, and I think the 400i was around 250 these days? 230 even maybe? I think they'd all be good choices, with 560 best if you can find a good deal. IMHO, the 560 is a smoother headphone than the 400i, which un-EQ'd can sound a tad bit bright/harsh; still similar sound, owning the 400i and hearing 560, sounded to me like more or less a more refined 400i. And yeah I think I remember reading that the Sundara's 500 price of a couple months ago was down to 350 or such, so that could also be a good contender.
And just another 'btw', you mentioned the 770, that's a closed headphone and its bass will also be significantly different than just any open headphone, be it the Senn 598, 6xx, AKG Q701 or 7xx, etc., so if you're not used to 'good' open headphones this would also give you another experience, in my earlier linked post I described Q701 vs 400i, and honestly, un-EQ'd, I'd think most would likely say that the Q701 has 'better' bass than 400i because most people cannot tell good bass from bad bass, and confuse a mid bass hump or boosted bass with better bass; since it often gives the impression of more (bigger) bass, and even more 'solid' ass... I think also there might be something about bass distortion from a dynamic driver adding some 'weight'... Anyway... But yeah, coming from 770 which has a ton of bass, I think you might be a bit disappointed if you expect any such bass quantity or 'weight' from a planar.
770:
400i:
But hey, I think you mentioned like $500, Senn 6xx + AKG 7xx + HFM 4xx total $560.