[jono454]

Long story short i've been hit with upgradeitis and I need some opinions from the more experienced members.
 
My current Setup
 
320Kbp/FLAC songs-->Bifrost-->Hifiman EF-5-->DT990/K702
 
My go to headphones are the DT990 600ohms and once in a while i'll use the K702s.
 
I generally like very musical songs and i'm not much of a bass head
 
I was considering the HE-500 but i've looked into several threads that mentioned the EF-5 and HE-500 might not be the best match so i'm stuck considering what I can do at this point if my budget is less than $500.
 
Also considered the HE-400 or HD600 but not sure if that'd be an upgrade or sidegrade.

 

[AuxNuke]

Jono, I replied to your post in the other thread regarding the sound of the HE-500 and HD 650 from the EF-5 amp.  See that thread for my response.
 
Considering you own the K702, SR60, and DT 990: it seems that you like a bright sounding phone.  Would this be accurate?  Are you looking for something with: A similar sound?  A complement this sound?

 

[MalVeauX]

Heya,
 
HE-400 is a definite upgrade and matches well with what you have.
 
Alt, maybe an Ultrasone PRO 2900.
 
Very best,

 

[Pianist]

There's no clear upgrade path from DT990 and K702 in sound quality as these are already top level cans in my opinion. If you want another sound signature/character, that's a different story.