Heya,
If this is for real, then here's a suggestion at your price range:
Mr Speaker Mad Dogs with Alpha Pads, but you have to masterfully equalize them for massive bass response. The E9 will power them sufficiently for this. Your goal would be to drop all frequency output from 100hz and up by -20db in the equalizer, but leave the rest of the bass frequencies down to the lowest possible at zero, or near zero. Do not raise above the zero line. Instant super bass headphones, and orthos handle is better than most dynamics I find.
Very best,