I'd put the HE 500 in that wierd Hi Fi low ground imo, like the T90 and LCD 2 are in that range, the LCD 3 HE 6 and T1 are above it, the W1000x the DT 880 and K702 are below it
that's how I'm looking at the whole thing. Still I'm going to get the T90 and a tube next spring [ugh a balanced tube that's going to suck price wise]
I think upper mid fi- entry level high end for starters, with top lvl rig, they are high end.
Lcd-2 is high end imo, they hold their ground quite well even against lcd-3 and hd 800/t1, he-500 does so as well i suppose, but lcd-2 start up higher, poor amping makes he-500 sound like worser headphone even though its not, so depends on setup as well