Hifiman HE-4 looks like a good option, but seems like it may be too heavy. Any recommendations for tube amplifiers ?

Currently have a pair of Beyerdynamic DT880 Pro's (250 OHM) and magni 2 + modi 2 stack. Wondering if there are any better options for sound quality. Willing to spend up to $700 on headphones and amp

They seem to be out of my price range. Anyone know anything about the HD 600's?

I have used the DT880's (250 OHM) for quite a while. I love how comfortable they are, but looking to see if I can find a better pair of headphones for under $400.  Will be pairing with a schiit modi 2 + magni 2 stack. I primarily listen to pop, EDM, rap, and classical music. Thanks for any...