It's 50mw at 300ohm which isn't the best for those. I have them and the DX3 Pro+ does a great job, especially if you equalize which reduces power with a preamp reduction needed most times.
On Ebay if you can get a Magni HeresyModi stack, or JDS Atom amp DAC stack they'll sound great equalized. I've seen the DX3Pro on ebay well under that budget. The 250 ohm are harder to drive because of their sensitivity.
If they get loud enough stock for you, you can eq the treble down if needed, or diyaudioheaven did a great article called Taming the treble as well with tips.
I really like the detail, and bass that doesn't drown everything else out.