Hard to beat KSC75, PortaPro, or KPH30i for good sound at a great price
I bought a pair from Drop a while back and they had the most bizarre sound I've heard in my entire life. Maybe my pair was broken.
They were less "headphones" and more of a "severe hearing damage simulator."
Bass was honestly kind of stunning for cheap, over-ear headphones -- at least in terms of how much of it there was -- but that's where the party ended. They were boomy on the low end, tizzy on the high end, and weird inbetween.
Measurements for the PortaPros seen actually look reasonably quite nice up to about 2khz at which things go haywire. Theoretically, that would also apply to the giant BIC speakers I measured a while back. The difference being that the BICs are pretty enjoyable in practice, perhaps due to reflected sound canceling out some of the weirdness.