Balanced headphone amps


Hello all,

I'm interested in trying a balanced headphone amp with my Hifiman HE-500. Has anyone out there paired a Schiit Mjolnir with these headphones? Any other favorites you'd like to brag on?
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CEntrance HiFi-M8 for a portable amp/DAC

SPL Phonitor 2 for wonderful balanced amp with loads of power to drive any headphone
Thanks, Shaker, I've read several glowing reviews of the SPL Phonitor, but it will break my bank. The Mjolnir is intriguing for that reason.
I have something called the Headroom Blockhead.....it is quite wonderful. The biggest problem is the on/off switch is in the back
Stringreen,

I also have a Headroom amp: an antique Little. My biggest problem with Headroom products is they are no longer in production. Too bad for headphone users.